A Ukrainian MP is calling on western powers to discuss the possibility of sending troops to his country.
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The EU and US have already imposed travel bans and asset freezes on a number of Russian and Ukrainian officials.
It was confirmed yesterday that Crimea is applying to become part of Russia, but many western leaders have denounced Sunday's referendum on the issue as illegal.
MP Andriy Shevchenko says tougher sanctions are already being considered, but troops may be needed to stop any further Russian actions.
