Russia and Ukraine swap prisoners on a "35-to-35" basis, including Oleg Sentsov, Mykola Karpyuk, Olexandr Kolchenko, Roman Sushchenko, and 24 Ukrainian Navy sailors detained by Russia during the 2018 Kerch Strait incident. The exchange includes Kirill Vyshinsky. The Dutch government says it "seriously regrets" that Volodymyr Tsemakh is included in the swap. U.S. President Donald Trump lauds the move as "perhaps a first giant step to peace."
Ukraine's Infrastructure Minister Volodymyr Omelyan says the ports of Berdiansk and Mariupol are effectively under blockade as Russia refuses to let any Ukrainian vessels leave or enter the Sea of Azov. President Petro Poroshenko calls on NATO to send warships to patrol the Sea of Azov.
Russia stops three Ukrainian Navy vessels from passing under the Kerch Strait Bridge by blocking it with a cargo ship. Russia claims they violated her territorial waters and ignored warnings. The navy vessels and their crews are seized after shots were fired. Russia says three Ukrainians were wounded. According to Ukraine, six of their sailors are wounded. Ukraine denies their ships did anything wrong.
Russia's Federal Security Service (FSB) says it has thwarted two armed Ukrainian incursions into Crimea with at least two killed, including one FSB officer, following a "massive fire fight" with "sabotage-terrorist" groups. Ukraine denies the Russian claims.
The Ukrainian parliament votes to ban all Russian films released after January 1, 2014, saying the move is aimed at improving “national security"; more than 430 Russian films and TV series fall under the new measures. Last month, the State Committee in Television and Radio-broadcasting in Ukraine removed 15 Russian TV channels from being broadcast in Ukraine.
Ukraine bans Russian cargo trucks from transiting its territory after Russia's Ministry of Transport barred Ukrainian cargo trucks because armed groups had been blocking some Russian trucks from entering Ukraine.
The European Union extends Russian sanctions for interference in Ukraine another six months, until 31 July 2016. The EU says it's extending the sanctions because the Minsk peace accords would not be fully implemented by the end of this year.
Ukrainian Prime Minister Arseniy Yatsenyuk says his country is imposing a moratorium on repayment of a $3 billion debt to Russia following Moscow's refusal to accept repayment terms already offered to other international creditors. This means Ukraine is likely to default on the debt, which is due Sunday.