Yes, they can do that even if the powers are at war. The presence of a sub belonging to an enemy power does not block movement.
Marsh
I never have seen this before.
this is the gerneral concept
Building only navel equipment with UK,US and Russia
to make one really Dirty and have Reverse Sealion
Just before the AXIS get there 8 City’s
Russia :build a hammer fleet with Russia to crush Denmark and take Denmark
do not care about every thing else just get your troops to novograd
US: build a fleet to invade Germany/berlin after russia’ Hammer
UK build planes planes planes fighter planes only
reinforce Germany/berlin after the capture of berlin.
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Russia
as Russia slow Germany down
but don spend ipc to build defence , go full offence , build 3 ships each turn and planes
US
you build the fleet to make sure you can land your troops on Berlin in 1 turn
so build aircraft carriers ,planes and transports with infantry
UK
First job is secure de sea… defeat enemy fleets
then your job is to defend and hold Berlin
after US secured it.
how about it?
what would you do about it if you where Germany?
Germany will have nothing to worry about since all those ships don’t land and the expensive planes will be dying to fight infantry and tanks.