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Russian solders walk as a local resident waves with Russian flag outside of a Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)
Russian solders walk as a local resident waves with Russian flag outside of a Ukrainian military base in the village of Perevalne, outside of Simferopol, Ukraine, on Sunday, March 2, 2014. Hundreds of armed men in trucks and armored vehicles surrounded the Ukrainian military base Sunday in Crimea, blocking its soldiers from leaving. (AP Photo/Ivan Sekretarev)

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Ukraine: Everything you need to know

CNN's Jim Sciutto explains the background behind the current conflict in Ukraine.

Ukraine: Everything you need to know

CNN's Jim Sciutto explains the background behind the current conflict in Ukraine.