In the midst of the Crimean crisis, US President Barack Obama is set to host Ukraine's new prime minister, Arseniy Yatsenyuk. The meeting, observers say, is a signal that could not be clearer.
Russia is responsible for the protection of all Russians no matter where they live, comes the message from Moscow. That strikes fear into its former Soviet Republics - and reminds them of recent history.
The EU and the US have accused Russia of violating international law by intervening in Crimea. DW examines the agreements that are supposed to govern relations between Moscow and Kyiv.