Long range hypersonic/cruise missiles with micronucleaer warheads. They have them demoing right now, they'll eventually work out the bugs. That said, it's all

Long range hypersonic/cruise missiles with micronucleaer warheads. They have them demoing right now, they'll eventually work out the bugs. That said, it's all armchair because a) We don't know what they really have b) we don't know what kind of amazing gear the US has hidden away or c) how any of it will really hold up in a war. None of it has been tested. So maybe the Russians launch a bunch of newfangled missiles and they basically don't find their target. Maybe they all do. Maybe the Russian s300's totally wipe out F22s, or maybe it's a mirage and they are irrelevant. So many factors: training, conditions, countermeasures, sabotage, overwhelming force etc. etc.. Maybe the vast number of crappy Chinese subs overwhelm the US navy over there. Maybe the US has a combination of tech+procedure that makes all of those little diesel subs pointless. Or maybe they only need 1 or 2 to 'get through'. My bet is that the Carriers are vulnerable, that Russia and China don't really have the ability to project much outside their nations (though Taiwan and HK are close), that the Americans will move around the world with impunity in a hot situation, except right in the vicinity of Russia/China where it would be a mess because they are both smart nations with 'good enough' gear, and China has a zillion bodies to throw at any problem.