An exchange of prisoners between Russia and Ukraine from their 3-year-old war was underway Friday, a senior Ukrainian official said, in one of the few signs of progress in international efforts to halt the fighting.

The swap was not yet finished, according to the official, who spoke on condition of anonymity because he was not authorized to speak publicly.

Harvard University is challenging the Trump administration's decision to bar the Ivy League school from enrolling foreign students, calling it unconstitutional retaliation for defying the White House's political demands.

In a lawsuit filed Friday in federal court in Boston, Harvard said the government's action violates the First Amendment and will have an "immediate and devastating effect for Harvard and more than 7,000 visa holders."

Prosecutors in Turkey issued arrest warrants for 63 active-duty military personnel Friday over links to a group accused of attempting a coup in 2016.

Istanbul Chief Public Prosecutor's Office said the suspects included four colonels and came from the army, navy, air force and gendarmerie. Early morning raids across the country resulted in 56 suspects being detained.

Since President Donald Trump announced his intent to end a half-century of U.S. sanctions on Syria, a debate has developed in his administration over how quickly and thoroughly that should happen.

At risk could be the future of a transitional government run by those who drove Syrian leader Bashar Assad from power late last year and hopes that it can stabilize the country after a devastating 13-year civil war that has left millions dead or displaced, the economy in ruins and thousands of foreign fighters still on Syrian soil.

Iran and the United States began a fifth round of negotiations over Tehran's rapidly advancing nuclear program Friday in Rome, with enrichment emerging as the key issue.

U.S. officials up to President Donald Trump insist Iran cannot continue to enrich uranium at all in any deal that could see sanctions lifted on Tehran's struggling economy. Iran's Foreign Minister Abbas Araghchi early Friday insisted online that no enrichment would mean "we do NOT have a deal."

Foreign Minister Abbas Araghchi said Iran will hold the United States responsible for any Israeli attack on its nuclear facilities after U.S. media reported Israel is preparing for an attack.

"We believe that in the event of any attack on the nuclear facilities of the Islamic Republic of Iran by the Zionist regime, the U.S. government will also be involved and bear legal responsibility," Araghchi said in a letter to the United Nations published on Thursday.

The White House violated a court order on deportations to third countries with a flight linked to the chaotic African nation of South Sudan, a federal judge said Wednesday, hours after the Trump administration said it had expelled eight immigrants convicted of violent crimes but refused to reveal where they would end up. The judge's statement was a notably strong rebuke to the government's deportation efforts.

In an emergency hearing he called to address reports that immigrants had been sent to South Sudan, Judge Brian E. Murphy in Boston said the eight migrants aboard the plane were not given a meaningful opportunity to object that the deportation could put them in danger. Minutes before the hearing, administration officials accused "activist judges" of advocating the release of dangerous criminals.

There are hardly any tourists in the scenic Himalayan region of Kashmir. Most of the hotels and ornate pinewood houseboats are empty. Resorts in the snowclad mountains have fallen silent. Hundreds of cabs are parked and idle.

It's the fallout of last month's gun massacre that left 26 people, mostly Hindu tourists, dead in Indian-controlled Kashmir followed by tit-for-tat military strikes by India and Pakistan, bringing the nuclear-armed rivals to the brink of their third war over the region.

North Korea's second naval destroyer was damaged in a failed launch this week, state media reported Thursday, sparking fury from leader Kim Jong Un, who wants bigger warships to deal with what he calls escalating U.S.-led threats against his country.

It's not common for North Korea to acknowledge military-related setbacks, but observers say the disclosure of the failed ship launch suggests that Kim is serious about his naval advancement program and confident of ultimately achieving that objective.

Two Israeli embassy staffers were shot dead late Wednesday outside a Jewish museum in Washington by a gunman who shouted "free Palestine," authorities said, with U.S., Israeli and other world leaders expressing outrage over the killings.

President Donald Trump condemned the attack in the heart of the U.S. capital, saying: "These horrible D.C. killings, based obviously on antisemitism, must end, NOW!"