Iran deal. It's hard for Putin to get along with U.S. presidents and political leaders because they were surrounded by post-cold war neocon advisers. For example, Bush, impressed by Putin, but he was controlled by Cheney/Condo. Obama's Ukraine/Russia affairs were handled by Biden team ...
Putin only has two friends in the western, Kissinger in US, and Merkel in Europe. But seems Merkel betrayed him.