> To be an invasion there needs to be a sustained on the ground presence of the invading force.

What exactly do you think is going to happen to the oil in Venezuela? Are you under the impression that they will simply leave them be and hope for the best?

United States will be placing military assets to secure it, just like they did with IRAQ. The entire point of this was to secure the oil and now they have to to guard it.

Establishing military bases on sovereign nations that you captured by force illegally is an invasion.