It is unclear what will happen next, but likely the regime or large elements of it will survive. Perhaps a more moderate faction will take control? That would be the best case scenario.
When one nation’s military illegally enters another nation’s sovereign territory to carry out military actions, that’s usually called an invasion.
Of course everyone knows it’s trivial for police to apprehend home invaders because invasion implies that they stay after they break in.
Air operations also are not seen as invasions, and the recent stealth strikes by the U.S. in Iran are not seen this way.
It appears to me that armed troops in place that are taking and holding territory for a prolonged duration are the definition.
The dictionary definition below is "the incursion of an army for conquest or plunder."
https://www.merriam-webster.com/dictionary/invasion
Is Maduro and his wife "plunder?" That would stretch this meaning, I think.