According to RIA Novosti, Graham said this at a meeting of the legal committee of the US Congress.

According to him, if Russia uses nuclear weapons in Ukraine, this should be regarded as "an attack on NATO as a whole."

He noted that with such a development of events, radiation will affect the whole of Europe.

Earlier, the official representative of the Russian Foreign Ministry, Maria Zakharova, said that the United States was manipulating the topic of the nuclear threat in its own interests.