Russian President Vladimir Putin and Ukraine’s Volodymyr Zelensky met in Paris Monday and agreed to a “full and comprehensive” ceasefire in eastern Ukraine by the end of this year. The ceasefire aims to end five-and-a-half years of fighting that has killed at least 13,000 people. Russia and Ukraine agreed to release all “conflict related detainees” by the end of the year and to resolve a dispute about Russian gas exports via pipelines that cross Ukraine. The two countries still disagree on the withdrawal of Russian-backed troops and elections in areas of Ukraine controlled by Russian-backed rebels.