David Welna David Welna is NPR's national security correspondent.

North Korean leader Kim Jong Un shakes hands with U.S. President Trump during their summit on June 12 in Singapore. Kevin Lim/The Straits Times/Getty Images hide caption

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Kevin Lim/The Straits Times/Getty Images

Doubts Remain Over North Korean Denuclearization

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Defense Secretary Jim Mattis speaking to reporters aboard an armored version of a 747 which functions as an airborne command post. David Welna/NPR hide caption

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David Welna/NPR

In A Tumultuous Administration, Defense Secretary Endures

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A Russian intercontinental ballistic missile is moved during military training in the mid-1990s near Irkutsk, Siberia, Russia. Arms control has been at the center of a decades-long discussion between Russia and the U.S. Associated Press hide caption

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Associated Press

Arms Control Surfaced In Helsinki, But It's Likely Just Talk

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How The Trump-Putin Summit Could Affect 2 Arms Control Treaties

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A U.S. Navy senior chief petty officer stands watch ahead of a ceremony inaugurating the U.S. anti-missile station Aegis Ashore Romania at Deveselu, Romania, in 2016. The station is part of NATO's anti-missile shield for Europe. Daniel Mihailescu/AFP/Getty Images hide caption

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Daniel Mihailescu/AFP/Getty Images

FACT CHECK: Trump's Claims On NATO Spending

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The National Security Rationale

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U.S. Secretary of State Mike Pompeo arrives for a signing ceremony between North Korean leader Kim Jong Un and President Trump in Singapore last month. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

Experts Skeptical That North Korea Is Serious About Denuclearizing

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U.S. service members walk off a helicopter on the runway at Camp Bost in Helmand Province, Afghanistan on September 11, 2017. Andrew Renneisen/Getty Images hide caption

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Andrew Renneisen/Getty Images

Pentagon Questioned Over Blackout On War Zone Troop Numbers

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The Air Force currently oversees many of the military's space activities, such as the experimental X-37B spacecraft. Michael Stonecypher/USAF hide caption

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Michael Stonecypher/USAF

Trump Calls For 'Space Force' To Defend U.S. Interests Among The Stars

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An F-35 Lightning II in flight. Congress is moving to block delivery of the warplane to Turkey, a NATO ally and member of the nine-nation consortium manufacturing the warplane. U.S. Air Force photo/Senior Airman Julianne Showalter hide caption

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U.S. Air Force photo/Senior Airman Julianne Showalter

Why Lawmakers Are Trying To Block Delivery Of Fighter Jets To Turkey

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A screenshot of a video shared on White House social media accounts. The video — a fake movie trailer encouraging cooperation between President Trump and North Korean leader Kim Jong Un — was shown to Kim by Trump himself on an iPad toward the end of their summit in Singapore Tuesday. White House/Screenshot by NPR hide caption

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White House/Screenshot by NPR

'Shaking The Hand Of Peace': Unpacking Trump's North Korea Movie Trailer

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North Korean leader Kim Jong Un views the Hwasong-15 missile in this undated photo released by North Korea's Korean Central News Agency. The missile is believed to be capable of reaching the continental United States. KCNA via Reuters hide caption

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KCNA via Reuters

'Complete, Verifiable, Irreversible' A Tough Goal For North Korea Summit

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Lessons Of A Collapsed North Korean Nuclear Deal

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North Korean leader Kim Jong Un, left, inspects what the North claims is a thermonuclear warhead. At right is a test of a North Korean ballistic missile. STR/Getty Images hide caption

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STR/Getty Images

Experts Say Denuclearizing North Korea Is No Small Task

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