Of course it is. The Russians have some peacekeepers in Transnistria to protect the Russians living there, but they cannot protect them in the long run without a land bridge.

American/British guy arrested in Transnistria 4-5 years ago by Russians for being a spy on his way back from Kiev to Romania. About 5 mins in.

https://www.youtube.com/watch?v=AdTAZlOhrM4