Nixon went to Mao
Nixon bowed deeply to Mao in common respect. And Mao said something like, ”OK we be friends now.”
Obama bows to the King of Saudi Arabia in common respect and is barbequed by his critics.
Reagan went to Gorbachev and ended the Cold War but we kept building weapons. And we have been building bases and NATO allies all around Russia against the agreement.
Now our first black President tries to make peace with Iran and he is attacked for it by his day-one critics and some of our supposed allies are trying to scuttle the attempt.
So much for diplomacy.