In the long term is will fuck over their ability to hack stuff. You're essentially ruining people's ability to develop talent at tech. Even if u want to train them in it as military, it would be new to them.
If everybody but the state is blocked, then any connections from Russia would be pretty fucking obviously the state. Honestly, that's the best thing that could happen, since it would make figuring out what they are doing easy as fuck. But I have no doubt they are smart enough to just send their teams to China or something like North Korea does.