Answer: the answer is B.
Explanation: he told the russians that the coup was bad.
I do not know any of the answers since I did not read the passage, the next time you could put a link to the passage so it's better to comprehend. That's my best suggestion.
I suggest: Put some context and background knowledge <em>before</em> putting the questions themselves for people to answer. If you don't do that, then people would be coming into this blindly.
checks and balances or maybe veto? I don't truly understand your question, sorry.