Of course it's a failed state and it's relations with the US are a construct and continuation of the cold war, full of gun crime, drugs and kidnapping, and the police can be paid off too. Though I doubt this will suddenly stop overnight with Guaido in. The US doesn't get on with any of its South...
Anyism or system that doesn't want to play ball with the US, rightly or wrongly, will have sanctions put on it, and any country trying to bypass the sanctions will get sanctions too. It is an oil rich country that cannot sell oil because of restrictions.
I don't know much about what is going on...