The reports of defections are coming almost solely from Pravda Russian news outlets. As to whether Ukraine has the ability to eject the Russians, it comes down to Ukraine's willingness to sacrifice. If it is willing to trade the lives of tens of thousands of its young men for those of tens of thousands of Russian servicemen, Russia will run, not walk, to its side of the border before this is over.
http://youtu.be/hYQvVqBZSsI
The head of the Security Service of Crimea Petyor Zima, Chief of Department of Internal Affairs in the Crimea Sergey Abisov, the head of Service for Emergency Situations Sergei Shakhov and acting Chief of the Border Guards of Crimea Victor Melnichenko all took an oath of allegiance to the people of Crimea.
Those who took the oath promised to respect and strictly observe the Constitution of the Autonomous Republic of Crimea.