Ukraine conflict: Russia steps up military drills
27 February 2014 Last updated at 22:17 GMT
Russia has conducted a series of what it calls "military preparedness drills" near the country's border with Ukraine.
The United States and Ukraine's interim prime minister have expressed concern at the activity.
Arseniy Yatsenyuk insisted that Ukraine would find a "political solution" to the tension in the country's autonomous Crimea region, a centre of pro-Russian sentiment.
Daniel Sandford reports.