I think Putin was very measured in dealing with Obama’s promotion of ISIS more or less in his backyard. I can understand him not trusting the US, and wanting to get back at us by establishing a foothold in our backyard.
Maduro and Chavez were stupid, greedy, arrogant, and incompetent. They mortgaged their country to Russia, Cuba, and China. The mortgage holders don’t want to go away empty handed.
The obvious question is what happens next? Do we send marines in to finish the job? Or do we just let this fester?