Doesn't look so different than seeing pics where (later) allied politicians or high rankin military personnel meeting with mr funny moustache and his court prior 1939. Or the pics from Jalta konferenz. Spokesmen from both capitalists and communists world shaking happily hands.
Was dining together the worst thing they ever did?
No, it's just normal. As long as even the deepest enemies think they have something to gain from eachother they are happily to share a dinner or to sell even their principles. Not to talk about the rulers of the not-so-important small nations who have no choice but to take what's given. Like giving a dog a bone for making it our friend. Once they refuse eating and wagging their tails foir the boine given, they will be crushed. Just everyday politics.