A senior negotiator on the Ukrainian side, Mykhailo Podoliak, urged "a real Easter truce" and asked Russia to consider "the remnants of its reputation."
OSCE says members captured in Donetsk and Luhansk
The Organization for Security and Co-operation in Europe (OSCE) said it is "extremely concerned" about the detention of several members of its monitoring mission in the eastern part of the country.
In a brief tweet, the Vienna-based organization said several of their mission members "have been deprived of their liberty in Donetsk and Luhansk" and that OSCE was "using all available channels to facilitate their release."
An OSCE spokesperson failed to provide specifics such as how many Ukrainian nationals involved in the monitoring mission had been detained or when or who may be holding them. Several OSCE observers have been killed or injured since the monitoring mission in eastern Ukraine began eight years ago.
Russia recently vetoed extending the mission. It is one of 57 participating member states that form the OSCE.
UN says fighting in Mariupol should stop 'right now'
"The lives of tens of thousands, including women, children and older people, are at stake in Mariupol," the UN's coordinator for the Ukraine crisis, Amin Awad, warned.
"We need a pause in fighting right now to save lives," he said in a statement. "They must be allowed to safely evacuate now, today. Tomorrow could be too late."
Russia claims to control the entirety of the port city save for a steelworks plant where several thousands of Ukrainian fighters are holed up. Earlier on Sunday, Ukraine also called for a truce as both Russia and Ukraine mark Orthodox Easter this Sunday.
Moscow blocks leading chess site
Chess.com, one of the most popular chess websites in the world, is now inaccessible in Russia. According to the Interfax news agency, the country's media supervisor Roskomnadzor has blocked two of its pages with information about the war in Ukraine.
Russian prosecutors demanded the move on Saturday. As the site uses https network protocol, barring the access to those pages has reportedly caused the entire site to be inaccessible in Russia.
Previously, Russian grandmaster Sergei Karjakin had called for the pages with information about what Russia calls its "special military operations" in Ukraine to be blocked.
Russia claims it struck arms depots in the Kharkiv region
The Russian Ministry of Defense said Sunday that it had struck nine Ukrainian military targets overnight.
Included among those targets were four arms depots in the Kharkiv region where artillery is stored and a facility producing military grade explosives in Dnipropetrovsk.
Ukrainian negotiator calls for a 'real Easter truce'
Mykhailo Podoliak, the senior Ukrainian negotiator and presidential advisor, urged a "real Easter truce" as both Ukraine and Russia mark Orthodox Easter.
On Twitter, Podoliak also urged a humanitarian corridor out of the besieged southeastern port city of Mariupol.
"Russia is continuously attacking the Mariupol Azovstal. The place where our civilians and military are located, is shelled with heavy air bombs and artillery."
Podoliak urged Russia to "think of the remnants of its reputation."
Ukraine says Russia deployed Iskander-M missile launchers near border
Russia has moved Iskander-M missile launchers to sites within 60 kilometers (40 miles) of Ukraine's border, said the General Staff of Ukraine's Armed Forces.
The mobile ballistic Iskander system has a range of up to 500 kilometers and is armed with two guided missiles capable of carrying both conventional and nuclear warheads.
"The enemy has increased the number of troops in (Russia's) Belgorod region by transferring and concentrating additional units," Ukraine's Armed Forces said in their daily morning update.
Zelenskyy hopes for 'eternal harmony' following peace in Ukraine
In his message for Orthodox Easter, Ukrainian President Volodymyr Zelenskyy said that the holiday is a reminder that "light wins over darkness," therefore "Ukraine must win!"
Zelenskyy said Ukrainians were praying for a day of "great peace" in Ukraine which would bring "eternal harmony and prosperity."
The politician recorded the video message at the Cathedral of St. Sophia in Kyiv where "a thousand years ago, on the field of the holy battle, the army of Kievan Rus-Ukraine defeated the [medival Turkic nations of] Pechenegs," Zelenskyy noted.
Both Russia and Ukraine trace their countries' origins to the medieval state of Kievan Rus. The Kremlin has argued that because of this, Ukraine's national identity is virtually identical to Russia's; Kyiv strongly objects.
Meanwhile, Patriarch Bartholomew, the spiritual leader of the world's Eastern Orthodox Christians, called from Istanbul for humanitarian corridors to be opened in Ukraine where he said "an indescribable human tragedy is unfolding."
"We call once again for an immediate end to the fratricidal war, which, like any war, undermines human dignity," Bartholomew added.
Switzerland impedes German arms deliveries: report
Switzerland has blocked the re-export from Germany to Ukraine of Swiss-produced ammunition used in German-made Marder infantry fighting vehicles, according to the Swiss newspaper SonntagsZeitung.
The move by Switzerland, which maintains a neutral status, has held up arms deliveries by Germany at a time when Berlin is already under fire for failing to supply Ukraine with heavy weapons to help fight off Russia's invasion of the country.
Switzerland has gone against previous practice and adopted EU sanctions aimed at punishing Russia for its invasion, but has insisted its neutrality does not allow it to send arms to conflict zones. Swiss officials have previously rejected Poland's request for the Alpine state to send arms to Ukraine.
The Marder vehicles are made by German arms manufacturer Rheinmetall but use Swiss-manufactured ammunition.
UK says Russian troops suffer from poor morale
Russia has made "some territorial gains" since starting the ongoing offensive in the east of the country, according to UK military intelligence. At the same time, UK officials said that Ukraine provided strong resistance and inflicted significant losses on the Russian forces.
"Poor Russian morale and limited time to reconstitute, re-equip and reorganize forces from prior offensives are likely hindering Russian combat effectiveness," they said on Twitter.
Ukraine governor says Russian attacks killed 8 in Luhansk
Russian shelling killed eight people and injured two more in Luhansk in eastern Ukraine, according to governor Serhiy Gaidai. The Ukrainian official two more people were seriously injured, and no less than eight buildings were destroyed in the region, which is partially controlled by pro-Russian rebels.
The numbers could not be independently verified.
Germany reportedly to buy Chinook heavy transport helicopters
Germany would buy 60 CH-47F Chinook heavy transport helicopters from Boeing worth around €5 billion ($5.4 billion), Bild am Sonntag newspaper reported, citing government sources.
Deliveries would begin after 2025-2026, and the helicopters are said to replace the aging CH-53G Stallion rotorcraft.
The paper said the project will be funded from the €100 billion fund Chancellor Olaf Scholz announced in February to modernize the military.
The paper said Defense Minister Christine Lambrecht would inform the parliament of the decision next week, but a spokesperson for the ministry said no decision on helicopter purchases had been made yet.
Opposition leader calls for German foreign and security policy review
The leader of Germany's opposition Christian Democratic Union (CDU), Friedrich Merz, has called for a review of German foreign and security policies over the past two decades.
"The entire German foreign and security policies of the past 20 years are in ruins. When this war is over, we must carefully analyze how this happened," he told newspaper Bild am Sonntag.
He did not spare his own party, saying "serious failures" were made on defense over the past two decades.
"Looking back, we must, unfortunately, say that all defense ministers of the past 20 years made wrong decisions about materiel and the condition of troops," Merz said.
UN Chief to stop in Turkey before visits to Russia and Ukraine
United Nations Secretary-General Antonio Guterres will visit Turkey on Monday before heading to Russia to meet President Vladimir Putin and then to Ukraine for talks with President Volodymyr Zelenskyy, the UN said in a statement.
In the Turkish capital Ankara, Guterres will meet President Recep Tayyip Erdogan.
Turkey has been trying to negotiate an end to the conflict, so far without success.
On Tuesday, Guterres will meet Putin in Moscow, followed by a trip Thursday to Kyiv in an effort to mediate an end to the war in Ukraine.
Zelenskyy criticized Guterres's decision to head to Moscow before Kyiv, saying there is "no justice and no logic in this order."
"The war is in Ukraine, there are no bodies in the streets of Moscow. It would be logical to go first to Ukraine, to see the people there, the consequences of the occupation," Zelenskyy said.
Ukraine blames Russian troops for forcibly recruiting civilians
Ukraine has accused Russian troops of forcibly recruiting civilians in occupied regions of eastern Ukraine.
In addition to young people, doctors were being targeted in the Kherson, Zaporizhzhia, and Kharkiv regions, Ukrainian military officials wrote on Facebook.
The UK's Ministry of Defense also noted similar conscription practices in the Russian-occupied Donbas and Crimea.
"Any enlistment of Ukrainian civilians into the Russian armed forces, even if presented by Russia as being voluntary or military service in accordance with Russian law, would constitute a violation of Article 51 of the Fourth Geneva Convention," the UK Ministry of Defense wrote on Twitter.
IAEA to provide Ukraine with equipment to keep nuclear plants running
Ukraine has asked the International Atomic Energy Agency (IAEA) for the equipment it needs to operate nuclear power plants during the war with Russia.
The agency says it includes radiation measurement devices, protective material, computer-related assistance, power supply systems, and diesel generators.
"We will coordinate the implementation of the assistance that the IAEA and its member states will provide, including by delivering required equipment directly to Ukraine's nuclear sites," IAEA Director General Rafael Grossi said.
Ukraine has 15 operational reactors at four plants.
Grossi was due to visit the decommissioned Chernobyl plant next week, on the anniversary of the 1986 disaster there.
Putin in church as Ukrainians told to stay home
Russian President Vladimir Putin attended an Easter mass conducted by the Russian Orthodox Church in Moscow.
The church has strongly backed the Kremlin leader's invasion of Ukraine.
Putin did not speak during the service.
Patriarch Kirill said he hoped the conflict in Ukraine would end quickly but did not condemn it.
His previous statements backing Russia's invasion have splintered the worldwide Orthodox Church.
On Sunday, many Ukrainians will observe Easter, but they were told to attend service virtually as authorities there have announced a nationwide curfew.
Zelenksyy to meet Blinken and Austin in Kyiv
Ukrainian President Volodymyr Zelenskyy is expecting US Secretary of State Antony Blinken and Defense Secretary Lloyd Austin to visit Kyiv on Sunday.
It would be the highest-level visit by an American delegation since the start of the war two months ago.
Zelenskyy had high hopes for the encounter, saying Ukraine was expecting more weapons to counter the Russian invasion. The White House, State Department, and Pentagon declined to comment.
Summary of Saturday's events in Ukraine-Russia crisis
A Russian strike killed at least eight people, including a baby, and wounded several others in Ukraine's Black Sea city of Odesa, Ukrainian President Volodymyr Zelenskyy said.
Speaking to the media, Zelenskyy said his country's army was not ready to launch a military operation to restore access to the besieged city of Mariupol. Ukraine says Russia resumed its assault on the last Ukrainian defenders holed up in a giant steelworks in the city, days after Moscow declared victory in the port city.
Ukrainian officials announced a nationwide curfew ahead of Easter Sunday. Authorities cautioned residents about the potential for increased Russian military activity during holiday celebrations.
Two Russian generals have been killed near Kherson, the Ukrainian Defense Ministry's intelligence directorate has said. Defense Intelligence reported the deaths on Facebook, adding that another general had been heavily injured and evacuated.
Former German Chancellor Gerhard Schröder has told the New York Times that he believes Russian President Vladimir Putin will not cut the supply of gas to Germany.
Schröder stressed that Putin is interested in ending the war with Ukraine, but added that ending the war won't be easy. He did not elaborate.