I would think/hope that you guys could at least maintain the submarine independently. Your sailors went through the same training as the US ones do for operating. and as far as I understand it (which is better than most people) subs don't really get refueled. Carriers do but by the time a sub needed to refuel it wouldn't be worth while simply because the technology has advanced so far.

Hopefully more of the western world invests into its own navy because as it stands the US is such an overwhelming force that I understand why everyone is so hesitant to stand up against us.