Foreign interference is only something other countries do to us. We never interfere in their politics. /s

I think you need to look into the CIA playbook. They're doing this actively, have been doing this for decades. Even lots of allied "democratic" countries are effectively just puppet states of the US: yeah people get to elect, but their foreign policy is solidly controlled by the US. They don't have real sovereignty, and without sovereignty they don't have real democracy.