Ukraine has put its army on combat alert and
warned Russia that military intervention will lead to war. The sense of
crisis deepened after President Vladimir Putin got parliamentary approval
to send troops across the border.
US weighs up sanctions on Russia over Ukraine
Mar 2, 2014
The US and Europe are putting pressure on Russia
to leave Ukraine.
They're hoping to use economic and diplomatic sanctions, but it's not
clear if they will work.
Reports from Washington DC.