I generally favor a G2 attack as there are very little Russian units on the board, the more rounds you wait to attack the more infantry they can stack in Moscow, Ideally on a G2 attack you can be attacking Moscow or on the brink of attacking when the allies threaten to land. The longer you wait to attack the longer you will have to fight a 2 front war.
Axis and Allies Europe 1940 2nd Edition ( AAE40.2) FAQ/question
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@Aknorian There is no rule that explicitly says you can’t do it. The rules simply don’t say that you can. Thus, it is prohibited by the fact that there is no process or conditions outlined for doing so.
The only mentions of change of control in the rules are claiming friendly neutrals on page 10 and after combat on pages 20 and 21. There is, however, a mention on page 13 that if you leave a territory empty you retain control of it until an enemy moves into it and captures it, which does not allow for the possibility of a “friendly” transfer of control.