Moscow (CNN) Russian President Vladimir Putin said Wednesday that US President Donald Trump's pledge to withdraw from the Intermediate-Range Nuclear Forces Treaty (INF) will be "very dangerous" and that the United States will be "putting their territories under risk of a possible response strike."

It comes after Trump said on Monday that the US would increase its nuclear arsenal until other nations "come to their senses," threatening an arms race days after he said he would withdraw the US from a Cold War nuclear treaty.

Putin said if the US withdraws from the INF treaty, Russia will have to respond.

"The main question is if the US will exit the arms treaty, what are they going to do with the newly appearing missiles?" the Russian President said during a news conference with Italian Prime Minister Giuseppe Conte.

"If they will be deployed in Europe we will of course have to respond in kind and European countries who agree to it (the US deploying its missiles) will have to understand that they are putting their territories under risk of a possible response strike."

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