A 30-day halt to strikes on energy facilities by Russia and Ukraine. That appears to be the outcome of a lengthy phone call between U.S. President Donald Trump and Russian President Vladimir Putin on March 18th. According to statements from the White House and the Kremlin, both sides agreed this conflict needs to end with a lasting peace. How significant was this phone call? Why is a truce so difficult to achieve? And what is China's take on this development?