This won't work at all. They'll just attack from a point of presence inside our borders. Any cyberattack that can be traced to a country is because they want it

This won't work at all. They'll just attack from a point of presence inside our borders. Any cyberattack that can be traced to a country is because they want it to be traced (eg to send a message) It'll be a possible sanction because it will hurt the Russian population and businesses. But it won't avoid any cyberattack.