The Russian Federation Security Council Vice Chairman Medvedev said on social media: "Talk about Trump's remarks about Putin's 'playing with fire' and 'very bad things' happening in Russia. I only know one very bad thing-World War III. I hope Trump understands this!" Earlier, U.S. President Trump posted on social media: "What Russian President Vladimir Putin didn't realize was that if it weren't for me, many very bad things would have happened in Russia. I mean really bad things. He is playing with fire!"