[Buckeye McFrog]

Smart move. Defending that border with Canada throughout the Cold War would have been a monumental task.

[CondorFlight]

Alternate histories;

1) Russian Alaska remains monarchist after the Revolution,and becomes what Taiwan is the mainland China.

2) Japan claims Alaska after the Russo-Japanese war.

3) Russian Alaska is part of the USSR, with missiles
pointed at the US.

[wally_bert]

The mini-series WW III comes to mind for some reason.