They have only two choices -
1) WW3 or a local war with endless Minsk-1 Minsk-2 Minsk-3 and Minsk-100000 truce agreements and, finally, getting rest 2 meters below the ground level
2) Welcome back to the Soviet Union, the Vladimir Putin`s sweet dream
What would you choose if you were Ukrainian? It's not that easy to answer this question honestly.