Hacking 101
Everybody pay close attention.
1. ALWAYS change your IP address
2. ALWAYS change your MAC address
3. SPOOF a fake IP / MAC address if you want somebody else to be blamed.
These steps are AUTOMATED for anybody that knows what they are doing, and nation states have their Routers check to make sure it's all randomized or spoofed and if it's not all trafic from their side is prevented.
Russia making a mistake like that is like forgetting to put on your shoes as you walk out into the snow. it just doesn't happen.