Brandon Williams, the nominee to lead the National Nuclear Security Administration, said he would recommend reliance on “scientific information” rather than a restart of explosive testing.

© Tom Williams/CQ-Roll Call, Inc., via Getty Images

President Trump may be turning relations with NATO and Russia inside out, but winter war games revealed that two militaries’ cooperation was unchanged.

© Jim Huylebroek for The New York Times

The new Trump foreign policy team has brought a dizzying message to European allies on A.I., Ukraine and more. It has already left many angered and chagrined.

President Volodymyr Zelensky of Ukraine and European defense ministers had expressed concern that they might not be present for talks between President Trump and Russia’s leader to end the war.

In his first trip abroad, the new U.S. defense secretary told Ukrainian and NATO officials that a durable peace could only come ‘with a realistic assessment of the battlefield.’

The Times interviewed Russian soldiers who said they face a brutal fight to dislodge determined Ukrainian forces from a sliver of Russian land. Trapped civilians fear catastrophe.

President Trump says he wants to make a deal for minerals from Ukraine in exchange for aid. That followed a long effort by Ukrainian officials to appeal to Mr. Trump’s transactional nature.

As Israel and Hamas accuse each other of violating the cease-fire deal, Israel’s prime minister has vowed a return to “intense fighting” if hostages are not freed by Saturday.

Prime Minister Benjamin Netanyahu of Israel said the cease-fire would end if Hamas did not release captives held in Gaza. But he did not say how many hostages had to be freed.

Deterring Russia from re-invading Ukraine, once this war ends, could require 150,000 troops and American help with air cover, intelligence and missile defense, experts say.

Rebels known as Naxalites have waged an insurgency that has ebbed and flowed over decades, but government operations have given them less space to maneuver.

The release of the three men was the fifth in a staggered hostage-for-prisoner exchange laid out in a cease-fire deal between Hamas and Israel.

Margery Hop Wong last saw her older brother Sgt. Yuen Hop in 1943. He was a soldier missing in action, until researchers solved the mystery behind his death.

The Southern California start-up, which builds flying drones and missiles, is set to raise up to $2.5 billion.

The Army helicopter that collided with a passenger plane above the Potomac River boasted an experienced crew doing “an unforgiving job.” Friends and relatives are still baffled and mourning their loss.

His boyhood dream to be an adventurous pilot was fulfilled thanks to World War II. But, as a civilian, racial prejudice kept him out of the cockpit.

European leaders will gather Monday to plot a rough path forward on defense. Wavering support from President Trump is likely to drive the debate.

Remains of 55 of the 67 victims have been recovered, officials said on Sunday as they prepared to lift the wreckage of the jet out of the Potomac River on Monday.

Capt. Rebecca M. Lobach’s family issued a statement that described her many achievements in the service.

The arrival of the first top Russian diplomat in Damascus since Bashar al-Assad’s fall kicks off negotiations over the fate of Moscow’s bases in Syria.