Samuel Oakford

• National Security

U.S. vehicles used by anti-Putin fighters in a raid into the Belgorod region of Russia highlights oversight challenges for how materiel can change hands.

• The Discord Leaks

Previously unpublished videos and documents reviewed by The Washington Post reveal Jack Teixeira’s preparations for a violent social conflict, his racist thinking and a deep suspicion of the government he served.

• National Security

The shooter in the Allen, Tex., mass killing showed signs of extreme hate as far back as 2013, but his online postings don’t spell out a clear motive, analysts say.

• The Discord Leaks

Investigators have spoken to online friends of alleged leaker Jack Teixeira, who hung out with him in an online chatroom.

• The Discord Leaks

In interviews with a member of the Discord group where intelligence documents were shared, The Washington Post learned details of the alleged leaker, “OG.”

• The Discord Leaks

Officials say Jack Teixeira, a National Guard technology support staffer, is suspected of mishandling U.S. military security secrets.

• The Discord Leaks

President Abdel Fatah El-Sisi in February planned to produce 40,000 rockets for Russia and instructed officials to keep production and shipment secret “to avoid problems with the West.”

• The Discord Leaks

It is a marked departure from public statements about the vitality of Ukraine’s army and is likely to embolden critics calling for negotiations to end the war.

• The Discord Leaks

The documents outline a wealth of information about the Ukrainian and Russian militaries, and include highly sensitive analyses about China and other nations.