On What Really Matters, Walter Russell Mead discusses Elon Musk’s departure from Washington, America’s nonexistent shipbuilding capacity, plans to revoke visas from Chinese students, and the conspicuous absence of Joe Biden’s foreign policy team from the new book on the "coverup" of his condition.

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Sudanese army soldiers take part in a military in Khartoum, Sudan, on August 23, 2025. (Getty Images)