The ones who are drunk or stupid looking are sent from Russia (no one else would go), whereas those who do not are Ukrainian or Russian from Ukraine. Like so:
Russian terror soldiers in training:
"What about at least a single piece featuring a serial number indicating that an equipment belongs to a Russian military?"
You say that because you know the Russkies are careful to send in their forces unmarked, but what you don't know is that they aren't always careful. From a captured Russian tank, insignia of the Russian airborn forces:
