[hal ogen]

I believe he is afraid that “world leaders” might slap him, throw shoes at him, ridicule him or demand he bows to them (again) or otherwise mock him. nobama is a feckless wimp of a being.

[hinckley buzzard]

I think you are on the right track. After squandering his political capital by his submissive posture, he is avoiding them because he doesn't want to hear what they will say.