“I exclude the possibility of using nuclear weapons in the current conditions,” RIA Novosti quoted Zas as saying in an interview with the Belarusian ONT TV channel.
He noted that of the CSTO member countries, only Russia possesses nuclear weapons.
Steps like the use of nuclear weapons could have catastrophic consequences, he said.
Earlier, Polish Foreign Minister Zbigniew Rau, in an interview with RMF FM radio station, did not rule out the participation of NATO forces in hostilities in Ukraine if nuclear weapons were used there.
Russian Ambassador to Turkey Alexei Yerkhov said that some representatives of the countries of the North Atlantic Alliance started talking about the possibility of using nuclear weapons against Russia.
UN Secretary General António Guterres urged world powers to "take a step back" in nuclear rhetoric, as well as to abandon "nuclear blackmail".