Ignoring the trolls, let's focus on what Russia can do with 300,000 conscripts.
Basically, nothing.
They can't train them in any way that matters. The USA has more than double the population of Russia. The USA has the best training pipeline in the world. The USA puts about 150,000 bodies a year through basic training.
Russia has no real NCO corps to pass on experience. The NCOs they have are basically concerned entirely with looting as much as they can.
They can't equip them. They've even run out of 1960s tanks to pull out of storage. Sure, they have lots more tanks in storage, but the engines are missing, due to that looting thing.
So, they'll give them a couple days showing them how to hold a rifle, and then send them out as cannon fodder. That would be why the west isn't caring about the numbers.
Maybe the purpose of it was to encourage threads like this. You know, get western fascists declare it all means that the west is DOOMED, and thus the west needs to surrender to Russia immediately.