I didn't propose that Russia had any capacity to realistically attack US mainland at any given point, but it had plausible capacity to attack US forces on allie

I didn't propose that Russia had any capacity to realistically attack US mainland at any given point, but it had plausible capacity to attack US forces on allied territories in attempt to overtake allied territory if it were not effectively countered by the allied effort. This could have easily developed into a strategic nuclear exchange. But what Russia did with relative success was to infiltrate US using its spy network and soft power. Even today there still is a large number of useful idiots in US and in the West in general who effectively help Russian goal even when it is has clearly displayed that it is a genocidal dictatorship.