At a November 2014 event marking 25 years since the fall of the Berlin Wall, Gorbachev warned that the ongoing war in Donbas had brought the world to the brink of a new cold war, and he accused Western powers, particularly the U.S., of adopting an attitude of "triumphalism" towards Russia. In July 2016, Gorbachev criticized NATO for deploying more troops to Eastern Europe amid escalating tensions between the military alliance and Russia. In June 2018, he welcomed the 2018 Russia–United States summit between Putin and U.S. President Donald Trump, although in October criticized Trump's threat to withdraw from the 1987 Intermediate-Range Nuclear Forces Treaty, saying the move "is not the work of a great mind." He added: "all agreements aimed at nuclear disarmament and the limitation of nuclear weapons must be preserved for the sake of life on Earth."