Hundreds of world leaders are gathering in Munich, Germany for a three-day security conference. The attendees include UN Secretary-General Antonio Guterres, US Defense Secretary James Mattis, Russian Foreign Minister Sergey Lavrov, British Prime Minister Theresa May and NATO Secretary General Jens Stoltenberg. The latest report issued by the Munich Security Conference says tensions have risen in many parts of the world over the past year, and major arms control treaties are at stake. Russia, Ukraine, Germany and France are expected to meet on the sidelines to discuss the conflict in eastern Ukraine.