"They (the U.S. authorities. - RT) will wait until at some point the terrorists will again carry out an attack in the style of September 11, 2001, but with an atomic or biological component, "he wrote in his Telegram channel.
Medvedev also warned that there is a possibility of the use of weapons of mass destruction if "one of the leaders of the nuclear countries loses his nerve."
"Moreover, the nuclear club is constantly expanding and a significant part of it is not bound by any obligations," he explained.
Earlier, Medvedev said that the United States showed its true face by using atomic weapons against Japan in 1945 without military necessity.
At a meeting of the UN General Assembly, Russia also called on all countries to sign and ratify the Comprehensive Nuclear-Test-Ban Treaty as soon as possible.