Maduro risks having ambassadors removed because he isnt recognized, which is a bit different from breaking relations. I believe it's legal for say the US to state it doesn't recognize Maduro, and ALSO to refuse abandoning its embassy, because Maduro isn't recognized, and therefore he lacks the authority to break relations and order that embassies be vacated. Should he take action against the embassy it would be considered an act of war, and the US president isn't Jimmy Carter.
What Latinamerican nations other than Colombia and Brazil do is irrelevant. Those cockroaches have been kissing Castroite butt for six decades, so I expect the same spinelessness and cowardice they have always exhibited. The question in my mind is whether the "Bravo Pueblo" has the testicles needed to create a government in exile which takes over Citgo and bank accounts, arm a few thousand men and take Zulia. I'm afraid Castro chose well, because Venezuela is both rich and its population is as tame as any I've ever seen.
So after january 10 we'll see if from 30 million venezuelans, and 3 million in exile, there's leadership and a few thousand volunteers ready to do what has to be done.