1) The net gain will be 0 VP, neither side has Domination as they both have 3 battlegrounds.
2) US get 6 VP for Presence +3 BGs, USSR gets 3 VP for Presence, net +3 VP to US.
3) Same as 2.
For Domination one side will need more countries overall, more BGs, and at least one non-BG.
2) US get 6 VP for Presence +3 BGs, USSR gets 3 VP for Presence, net +3 VP to US.
3) Same as 2.
For Domination one side will need more countries overall, more BGs, and at least one non-BG.