Q&A: What is the state of play in Ukraine crisis?

Here are the things to know about the conflict over Ukraine and the security crisis in Eastern Europe:

Ukrainian Army soldiers pose for a photo. Picture: Emilio Morenatti/AP

World leaders waited to see if Russian President Vladimir Putin would order troops deeper into Ukraine.

At the same time, they worked to maintain a united stance and vowed to impose tougher sanctions in the event of a full-fledged invasion.