The obviously reply to that would be "The US forces were invited by the democratically elected Venezuelan leadership to put a stop to the ongoing coup"

The concept of "international law" here is pretty confusing because to begin with you'd need to choose who decides what counts as a violation of Venezuelas sovereignty. Presumably the people backed by the US are okay with this, and team Maduro isn't.

Presumably, if you were to agree that Maduro wasn't in fact the legitimate leader of Venezuela, you'd just consider this an internal issue with US helping in local law enforcement matters.

If you disagree and consider Maduro to be the legitimate president, presumably no amount of justification will help you see it differently. But then, I'm not sure anyone particularly cares about your opinion either.

There is no such thing as international law.

Much like “intellectual property”, “international law” is a nonsense term that tells you only that the person who employs it lives in their own bubble, captured by powerful interests of others.