The report, which calls for accountability for targeted killings by armed drones and for greater regulation of the weapons, says the drone strike violated the UN Charter.

The United Nations and the U.S. State Department announced Tuesday that Washington had submitted formal notification that the U.S. would withdraw from the WHO within a year.

The app, which is not available in China, has sought to distance itself from its Chinese roots to appeal to a global audience and has emphasized its independence from China.

Pompeo called for the U.S. to compensate the Iranian people for the damage and vehemently opposed any extension of the arms embargo.

Chinese prosecutors this month charged Canadians Michael Kovrig, a former diplomat, and Michael Spavor, a businessman, for suspected espionage.

The move comes ahead of a three-day meeting of China's parliament from Sunday expected to enact new national security legislation for Hong Kong that has alarmed foreign governments and democracy activists in the territory.

Chinese authorities announced the charges against Michael Kovrig and Michael Spavor on Friday, after they had spent more than 550 days in prison without access to lawyers or family.

Pompeo and his deputy Stephen Biegun held closed-door talks with the Chinese Communist Party's top diplomat, Yang Jiechi, at Hickam Air Force Base in Honolulu.

Activists in Hong Kong say the law will undermine the region's autonomy and might be used to suppress political activity.

U.S. Secretary of State Mike Pompeo called for Beiing to reconsider taking over Hong Kong's national security legislation and warned of an unspecified U.S. response if it proceeds.