West warns Russia of sanctions amid Ukraine unrest
US Secretary of State John Kerry has urged Russian President Vladimir Putin to publicly call on separatists in Ukraine to lay down their arms.
He said Russia would face "greater costs" unless it took action to show that it supported peace in Ukraine.
A meeting of Nato foreign ministers stopped short of imposing more sanctions but did approve measures to bolster Ukraine's armed forces.
Emily Buchanan reports.
25 Jun 2014