Why couldn’t this be resolved using the international institutions we already have? What needs to change?
The institutions work if all countries abide by their rulings. The US doing this sort for things is destroying the institutions we have, chief of all the UN and the ICJ, put in place at the end of World War 2 to avoid a repeat. We have not learned.
That would be the UN. The last time the UN invaded a nation was in 1950. That happened because the Soviet Union boycotted the UN, so it wasn't able to veto it.
For the UN to ever fix a international issue it would require that country to anger all 5 UN powers. Venezuela has Russia and China on its side, so nothing would have happened.
> Why couldn’t this be resolved using the international institutions we already have?
They’re dead and have been for decades. The reason is they had no enforcement arm.