Crisis in Crimea

Russian servicemen guard the Belbek Sevastopol International Airport in the Crimea region March 4 2014.

Secretary of State John Kerry stands beside a barricade at the Shrine of the Fallen in Kiev March 4 2014.

Ukrainian servicemen wait at Belbek airport in the Crimea region March 4 2014.

Russian military armored personnel carriers drive on the road from Sevastopol to Simferopol March 4 2014.

Ukrainian servicemen march away after negotiations with Russian troops at the Belbek Sevastopol International Airport in the Crimea region March 4 2014.

A Ukrainian Navy ship sets sail in the Bosphorus on its way to the Black Sea in Istanbul March 4 2014.

Military personnel believed to be Russian servicemen march outside the territory of a Ukrainian military unit in the village of Perevalnoye outside Simferopol March 4 2014.

A pro-Russian holds a Russian flag behind an armed servicemen on top of a Russian army vehicle outside a Ukrainian border guard post in the Crimean town of Balaclava March 1 2014.

Members of Vienna Ukrainian community protest against Russian troops in Ukraine outside the U.S. embassy in Vienna March 4 2014.

People react as cars with Russian and Crimean flags pass by in Simferopol March 2 2014.

Pro-Russian protesters with Russian flags take part in a rally in central Donetsk March 1 2014. The banner reads "In Russia we have brothers In Europe we are slaves".

A Russian soldier lies with his back to Ukrainian fighter jets he watches Ukrainian serviceman at the Belbek airport in the Crimea region March 4 2014.