The Trump administration has revived its diplomatic drive to end Russia’s war in Ukraine, as US envoys Steve Witkoff and Jared Kushner traveled from Moscow to Kyiv in a high-profile effort to lay the groundwork for another round of negotiations. But after separate meetings with Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskyy, the central question remains unanswered: Has Moscow changed its position enough to make a settlement possible? Three former US ambassadors to Ukraine interviewed by RFE/RL on September 6…