I can't see how the Soviets could credibly project an amphibious battle group to Guam -- coming out of Soviet ports in Siberia means running a gauntlet past the air and sea elements of the Japanese Self Defense Forces plus the USAF and USN assets supporting operations in the ROK. (Hell, the South Koreans would probably be up for taking a bit of time out of their generating sorties against North Korean units to destroy a Soviet amphibious battle group sailing by.
Alternately, they could be coming out of Vietnam, where GDW has a Soviet garrison, but then those guys would have to make it past the Philipines, past the PRC's navy and naval aviation assets, as well as possibly a belligerent Taiwan as well (besides USN and Australian navy vessels in the area).
By comparison, the Alaska invasion at least doesn't require a run past numerous enemy held air and naval bases. (The Alaska operation itself would tend to argue against the Soviets pulling any other major amphibious operations as well -- suspension of belief that they could pull off Alaska is one thing, but Alaska + another major amphibious operation against a very remote target is rougher . . .)
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