President Barack Obama orders a trade ban with Crimea, to show the US "will not accept Russia's occupation" of the Ukrainian region.
Turkey issues an arrest warrant for influential US-based cleric Fethullah Gulen, who is accused of organising an anti-government movement.
Belarus's central bank moves to protect its currency by imposing a new tax, as it feels the knock-on effects of the fall in the Russian rouble.
Russia warns US over sanctions bill
Putin seeks to ease economic fears
Russians fear return to 1998 crisis
Anti-Islam march in German city
Armed men enter Belgian apartment