Concerns over 'power vacuum' in Ukraine

Russian President Vladimir Putin ratcheted up the military pressure on the new Ukraine government today as he ordered military exercises near the border with Ukraine.

Elsewhere, anti-Russian groups have held rallies in the capital of Crimea region in Ukraine.

ITV News Europe Editor James Mates reports:

More: Pro and anti-Russian groups hold rallies in Ukraine

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US warns against Russian military intervention in Ukraine

The United States has warned Russia that it would be a "grave mistake" to embark on military intervention in Ukraine.