But Obama told them to stop, what gives?

Via NBC News:

Russian forces began moving troops into Ukraine’s Crimea region by ferry on Monday after seizing control of the border post on the Ukrainian side of the waterway, Ukraine’s border guards said, according to Reuters.

Russians who seized the isolated Black Sea peninsula have been surrounding the ferry terminal for days but until now had not taken control of Ukraine’s border guard station.

A border guard spokesman said Russian troops seized the checkpoint after the border guards tried to stop two buses carrying seven armed men, and the next ferry brought three truckloads of soldiers across.

Earlier on Monday, the Ukrainian border guards said they had seen Russia assembling an armored column on its side of the 2.7 mile wide Kerch strait that separates the Crimea peninsula from southern Russia.