While Ukraine has targeted Russian energy facilities for years, the quantity and firepower of Ukrainian drones and missiles have risen. This has allowed Kyiv to hit refineries as far as Tyumen, 1,200 miles away in Siberia, and permitted the spectacular raid that broke through thick layers of air defenses and destroyed Moscow's main refinery on June 18, the turning point of the current crisis.

Vance Earned Up to $7.4 Million Last Year, Mostly From Book Royalties

Vice President JD Vance made as much as $7.4 million last year from book royalties, investments and his venture-capital firm, according to his latest financial disclosure report.

Vance continues to rake in money from his bestselling memoir, "Hillbilly Elegy," and from investments in a range of assets including real estate and exchange-traded funds, according to the federal filing released Tuesday.

Write to gareth.mcpherson@wsj.com