Hours after Russian President Vladimir Putin ushered in a new phase to the ongoing war in Ukraine with a partial nationwide military mobilization, his longtime top diplomat, Foreign Minister Sergey Lavrov, spoke with Newsweek Senior Foreign Policy Writer Tom O'Connor about the state of the conflict and its implications for Moscow's relationships with the international community, including other leading powers the United States and China. Lavrov's career in diplomacy extends back half a century through the heat of the Cold War, the fall of the Soviet Union and the rise of Putin, who appointed him as foreign minister in 2004....