Ukraine: What happened today, Thursday, March 31?

A Ukrainian serviceman takes a selfie photograph standing on a destroyed Russian tank after Ukrainian forces overran a Russian position outside Kyiv, Ukraine, Thursday, March 31, 2022. (AP Photo/Vadim Ghirda)
Russia's President Vladimir Putin threatened on Thursday to halt contracts supplying Europe with a third of its gas unless they are paid in roubles, his strongest economic riposte so far to crushing Western sanctions over his invasion of Ukraine.
The continent's biggest recipient of Russian gas, Germany, called the ultimatum for Friday "blackmail".