>"would not have helped Venezuela one bit"

I think it would, meaning that right from that exact minute the US and Russia will be very busy and Venezuela left to it's own devices. Does not mean Venezuela would feel any better of course.

This is entering fantasy land.

There's no effective way of Russia to militarily help Venezuela and strike any US carrier. Same with China. You haven't proposed any because there is no feasible way.

Even if they could, such action would have been followed by the US knocking Venezuela out and taking them out of the equation. A neighboring ally of an actively engaged hostile power wouldn't be "left to its own devices".