The only real military reaction here from Russia would be nuclear. They just don't have the conventional military means currently to fight a US fleet half the world away. While going nuclear is never impossible, yes the enclosed rat, the chance of it happening over this Venezuela thing isn't larger than over any other Trump fart. For example the interventions in Iran by Israel/USA are already way more likely to cause this kind of madman reaction, just because of proximity. Iran is in Russia's backyard, Venezuela isn't.