Russian President Vladimir Putin was heckled during his surprise visit to the occupied southeastern Ukrainian port city of Mariupol. CNN's Ivan Watson reports.

Video appears to show Russian President Vladimir Putin in Mariupol, Ukraine. The Kremlin released a statement saying Putin made a "working visit" to the occupied city. The visit comes just days after the ICC issued an arrest warrant for Putin. CNN's Ivan Watson has more.

North Korea must be ready to launch nuclear counter strikes at any time to deter war, state media quoted leader Kim Jong Un as saying on Monday, as he accused the United States and South Korea of expanding joint military drills near the country's doorstep.

Chinese leader Xi Jinping will fly to Moscow this week to meet with President Vladimir Putin in his first visit to Russia since Putin launched his invasion of Ukraine more than a year ago. CNN's Selina Wang has more.