Russia and Ukraine sign a UN-backed agreement to allow the export of millions of tonnes of grain from blockaded Black Sea ports.
Ukraine protests an alleged announcement by Russia that, beginning next week, it would be closing the Kerch Strait to foreign warships and state ships until October.
The governments of Germany, Poland, and Sweden each expel a Russian diplomat to reciprocate the Russian government's expulsion of three European Union diplomats on February 6.
Prominent Ukrainian-based journalist Pavel Sheremet of the Ukrayinska Pravda is killed in a car bombing in Kiev.
Russia is to deploy its advanced long range S-400 surface-to-air missile system to Feodosia in the Crimean Peninsula next month for the first time.
Ukrainian pilot and parliamentarian Nadiya Savchenko, who has been detained in Russia since 2014, arrives home following a dramatic prisoner swap with Russia.