By negotiating Assad's exit from Syria, Moscow could help to end the violence and bloodshed, and "reset" world perceptions of Russia, writes Wilson Center President Jane Harman in The Washington Post.

Russia, which has offered political and military support to the Assad regime, has the best chance to broker a deal that would have a real impact. (Remember that thousands of cheering Syrians, waving Russian flags, welcomed Lavrov to Damascus in early February.) And the window to act is closing. Any day now, the United Nations may indict Assad for crimes against humanity.

Read the entire article in The Washington Post.