Vladimir Putin calls Barack Obama to discuss Ukraine
28 March 2014 Last updated at 23:07 GMT
Russia's Vladimir Putin has telephoned President Barack Obama to discuss the US proposal for a diplomatic solution to the crisis in Ukraine, the White House has said.
Mr Obama suggested that Russia put a concrete response in writing, his spokesman said in a statement.
According to the Kremlin, Mr Putin suggested examining how the situation could be stabilised.
The BBC's Mark Mardell reports.