Seems like Guyana is gearing up to be the US proxy against Venezuela.
problem is, they have to cross Brazil to get to Venezuela, and just like we didn't let venezuela cross to invade Guyana, we sure as shit won't let Guyana cross either.
And before anyone says anything, venezuela and Guyana share a border, but their border is just mountains covered in dense rainforest, impossible to cross in numbers, they need the brazilian roads connecting the countries for any real military action.