In March 2012, Obama whispered to the Russian president at the time that he would be more flexible to cave to their wishes after the election. He just needed to lie to the American people for eight more months.
The Obama administration signed on to the worthless Paris climate agreement, which leaves Russia and OPEC more powerful to control oil prices and essentially does nothing about the climate. It destroys the U.S. economy by decimating our fossil fuel industry.
In 2009, Obama backed out of a promise to put up missile shields in Poland and the Czech Republic, which certainly appeased Putin. It showed NATO members that the U.S could not be trusted to keep its word.