Yes,they are protected.The northern borders are fully protected by battle hardened National Guard troops on rotation and soilders returning from training abroad. Only a large deployment of Russian soilders would be a worry- these haven't been made.
I dont know how many Russian troops are in Belarus,but they are deffo there,apparently on training exercises.
Russia is mobilizing women in Donetsk,yet can afford to have regular troops "training".
Its just strange to me.
Slava Ukraini.