Russia Pummels Kyiv as It Torments Ukrainian Civilians

A strike that killed six was the latest in a series of aerial assaults, many of which have targeted the power grid in an effort to deprive Ukrainians of energy as winter looms.

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Putin Brandishes Menacing Nuclear Weapons as Talks With U.S. Falter

Touting new weapons tests, Moscow signals to Washington that it must contend with the Kremlin’s power and negotiate.

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What to Know About US Nuclear Weapons as Trump Threatens to Restart Testing

Though the country’s nuclear arsenal has undergone no explosive testing for decades, federal experts say it can reliably obliterate targets halfway around the globe.

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Trump and Xi Ease Off the Trade War, but New Nuclear Threat Brings a Chill

The two leaders reached an agreement on fentanyl, some tariffs and rare earths, at least for a year. But even as the global trade picture cleared a little, Mr. Trump spurred new worries about nuclear proliferation.

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Putin Announces Test of Tsunami-Making Nuclear Weapon

The test comes days after President Vladimir V. Putin announced the previous trial of another Russian nuclear weapon.

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North Korea Conducts Missile Test Ahead of Trump Visit to South

The country has yet to respond to President Trump’s overtures to meet again with Kim Jong-un, its leader.

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In a Looming Nuclear Arms Race, Aging Los Alamos Faces a Major Test

The lab where Oppenheimer developed the atomic bomb is the linchpin in the United States’ effort to modernize its nuclear weapons. Yet the site has contended with contamination incidents, work disruptions and old infrastructure.

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Burevestnik Nuclear Missile Tests Successful, Russia Says

Because of its power source, the Burevestnik can remain airborne far longer than other nuclear-armed missiles.

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Trump Backs Off Suggestion to Give Tomahawks to Ukraine, Again Deferring to Putin

At the White House, President Volodymyr Zelensky of Ukraine made the case for why a weapons sale would help end the war. Mr. Trump at first seemed receptive, then expressed reservations.

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Zelensky to Meet With Trump to Discuss Weapons and Peace Prospects for Ukraine

President Trump is energized after the Mideast deal between Israel and Hamas. But President Volodymyr Zelensky of Ukraine is seeking more weapons to force Russia to negotiate.

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