they and their allies would be too weak to do anything about it.

columbia proved that the governments in latin america are unable to enforce their policies in the interior of their countries where non-government militias/juntas have control.

add to that the interiors of both venezuela and brazil are so heavily forested and mountainous that trade is already almost non-existent during peace time; so a couple farmers with american guns and an american stipend to stop the trickle of trade through the land borders is all it would take to prevent a ally like brazil from being able to help at all.

the international community would be ineffectual as well considering that neither the un nor the icc/icj has any strength in stopping isreal in it's ethnic cleans plans and would-be allies like mexico keeps arms length distance from venezuela due to economic pressure like trump's tariff threats; meaning that the rest of latin america is going to pretend that venezuela's encirclement not happening.

venezuela is fucked.