U.S. Secretary of State John Kerry called Friday on Shiite Huthi rebels in Yemen and those who have "influence over them" to come to the negotiating table and end the unrest in the Gulf nation.

"This has to be a two-way street," Kerry told reporters, saying Saudi Arabia was moving to a humanitarian phase of its Yemen campaign and "we need the Huthi and we need those that can influence them to make sure that they are prepared to try to move... to the negotiating table."

Bulgaria's parliament recognized for the first time on Friday the mass killings of Armenians in the Ottoman Empire a century ago, holding a minute's silence but avoiding the word genocide.

The special declaration approved by parliament in a 157-36 vote condemned the World War I killings as a "massacre" while highlighting the difference between the former Ottoman Empire and modern Turkey.

Ukraine accused Russia on Friday of resisting a peaceful end to fighting in eastern Ukraine and called for weapons from its allies, saying it is striving to settle the separatist conflict.

"The situation is difficult. Russia does not want peace," Prime Minister Arseniy Yatsenyuk told parliament.

South Korea and the United States on Friday wrapped up annual joint military exercises that always raise tensions with North Korea, which views them as provocative rehearsals for invasion.

Pyongyang conducted a series of short-range missile launches into the sea to register their displeasure with the joint drills, which began simultaneously on March 2.

President Barack Obama's admission Thursday that a U.S. drone strike accidentally took the lives of two hostages has raised fresh questions about the limits and the risks of the country's "targeted killing" campaign.

Since taking office in 2009, Obama has relied heavily on drone raids to hunt down Al-Qaeda leaders and other Islamist extremists from Pakistan's tribal areas to Somalia and Yemen.

Nuclear powers join non-nuclear nations on Monday to launch a conference on non-proliferation, buoyed by the Iran deal but alarmed by slow-moving U.S.-Russian disarmament.

U.S. Secretary of State John Kerry will address the conference that reviews the nuclear Non-Proliferation Treaty (NPT) and he may meet on the sidelines to discuss the hard-fought Iran deal with Foreign Minister Mohammad Javad Zarif.

The congressional panel investigating the 2012 attacks on a US mission in Benghazi called on former secretary of state Hillary Clinton on Thursday to testify at two public hearings, the first next month.

Benghazi Commission chairman Trey Gowdy wrote to an attorney for Clinton requesting her participation in a hearing during the week of May 18, with the precise day to be determined later.

An Iranian convoy of ships suspected of carrying weapons for Huthi rebels in Yemen has turned around and headed north, away from the war-torn country, U.S. defense officials said Thursday.

The move came after the USS Theodore Roosevelt aircraft carrier and other American warships deployed off Yemen's coast to track the Iranian flotilla and possibly prevent any arms deliveries to the Iran-backed Shiite rebels. 

Russian hackers were able to access an unclassified Pentagon computer network earlier this year, U.S. Secretary of Defense Ashton Carter said Thursday.

"We quickly identified the compromise and had a team of incident responders hunting down the intruders within 24 hours," Carter said during a speech on technology and cybersecurity at Stanford University in California.

President Barack Obama revealed Thursday that an American and an Italian hostage were accidentally killed in a covert U.S. counter-terrorism operation near the Afghan-Pakistan border in January, taking "full responsibility" for the tragedy.

A senior al-Qaida leader, an American, was also killed in the operation and the group's English-language spokesman, U.S. convert Adam Gadahn, died in a separate strike.