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Signs of a possible conflict between pro-Russian and Ukrainian forces came after Putin signed a treaty to annex Crimea. On Tuesday, Russian military personnel surrounded a Ukrainian military base in Simferopol, and when masked gunmen descended on the base, a member of the Ukrainian military was killed. The next day, nearly 300 armed pro-Russian supporters took over a Ukrainian navy headquarters in Sevastopol, replacing Ukrainian flags with Russian flags.

Image Source: Getty / Dan Kitwood