For any invasion planned by the Russians, an interesting tool would be the Orlyonoks. Several had been built (5) prior to the fall of the USSR and three are reported in service as late as 1993. In the event of continuous cold war and Twilight War more would have been built, giving the russian the hability to carry out fast small scale attack in several areas (150 men and 2 vehicles: BMP, BTR or PT-76).
http://en.wikipedia.org/wiki/A-90_Orlyonok
In addition, I have no doubt that the missile launcher version would have seen production as well (at least limited) and could have constituted a bad surprise for NATO on several occasions. A fast attack craft moving at 400mph and capable of firing 6 anti-ship missiles to its target is a threat (IMO). They could have played an interesting role in the NATO defeat in the Far North.