China presses into Central Asia with the opening of its first import gas pipeline from Turkmenistan.
Prospects for a U.S.-China agreement on climate change are still uncertain.
U.S.-China trade disputes are on the rise, but experts say broader tensions may ease.
Experts see little chance for a U.S.-China strategic breakthrough following a visit from a top Chinese military official.
China says it will cooperate with the International Energy Agency to improve data.