Xinhua world news summary at 0050 GMT, June 2

At least four people were killed during a U.S. drone strike in Pakistan's northwest tribal area of North Waziristan on Monday night, local media reported.

Geo TV said that the U.S. pilotless aircraft fired two missiles on a car believed to be carrying suspected militants in Shawal area of North Waziristan, a semi-autonomous tribal area along Pakistan-Afghanistan border. (Pakistan-Drone Strike)

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WASHINGTON -- The U.S. State Department said on Monday that an American citizen recently held in Yemen has been released.

Casey Coombs has arrived safely in Muscat, Oman, and he was "in stable condition," State Department spokesperson Marie Harf said. (US-Yemen-Hostage)

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UNITED NATIONS -- UN Secretary-General Ban Ki- moon on Monday condemned South Sudan's decision to expel Toby Lanzer, UN deputy representative to the country.

Ban called on the government of South Sudan to reverse its decision immediately, saying Lanzer, also UN's resident coordinator in South Sudan, "has been instrumental in addressing the increasing humanitarian needs of conflict-affected communities in the country, and ensuring that life-saving humanitarian assistance reaches the most vulnerable," said a statement released by Ban's spokesperson. (UN-South Sudan-Expulsion)

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MOSCOW -- Russian Defense Minister Sergei Shoigu on Monday praised recently-ended joint Russia-China sea drills "Joint Sea-2015" for high-level coordination.

"The training generally demonstrated a high level of interaction between Russian and Chinese sailors. All combat training tasks were fulfilled with good and excellent results," Shoigu said at a defense meeting. (Russia-China) Endi