The U.S. special envoy for Afghanistan, Zalmay Khalilzad, who just returned to Washington after a series of stops in the Middle East and Europe, is journeying out again to several key countries as part of efforts to push a U.S. peace initiative for the war-torn country.

China has condemned a visit by Indian Prime Minister Narendra Modi to a disputed border region which triggered a war between the nuclear-armed neighbors in 1962.

Pakistan, long at odds with the United States over the war in Afghanistan, has begun to play a behind-the-scenes but central role in supporting U.S. peace talks with the Afghan Taliban, including by facilitating travel to negotiations, U.S. officials and Taliban sources told Reuters.