“Putin & I discussed forming an impenetrable Cyber Security unit so that election hacking, & many other negative things, will be guarded and safe,” he said following their talks at the G-20 summit in Hamburg, Germany.

Trump said he had raised allegations of Russian interference in the 2016 U.S. presidential election. “I strongly pressed President Putin twice about Russian meddling in our election. He vehemently denied it. I’ve already given my opinion…..”

He added: “We negotiated a ceasefire in parts of Syria which will save lives. Now it is time to move forward in working constructively with Russia!”

Follow CNBC International on Twitter and Facebook.