Manila, Sept. 14 -- United States President Donald Trump said he is prepared to impose tough sanctions on Russia if all NATO members act together and stop buying its oil.

"I am ready to do major sanctions on Russia when all NATO nations have agreed and started to do the same, and when all NATO nations stop buying oil from Russia," the US leader wrote on his Truth Social page.

Trump explained that in his opinion, NATO is not fully committed to "winning," and he called the purchase of oil from Russia by some alliance countries "shocking."

He said this has weakened the alliance's negotiating position.

"Anyway, I am ready to 'go' when you are. Just say when," Trump wrote.

He also called on NATO countries to impose 50 to 100 percent tarif...