Russian troops in Transnistria
There are russian troops in Transnistria, along the local separatist forces, and Ukraine had to deploy troops to their border just as a precaution, if left undefended, they could do cover operations near Odesa (that was the original invasion plan, push and create a land bridge between Crimea and Transnistria). If the region is demilitarized, either by diplomacy (unlikely due to russian influence on the separatist
Credit to : Kanal13