On What Really Matters, Walter Russell Mead discusses President Trump’s call with Putin, Israel’s attacks in Gaza, America’s attacks on the Houthis, and how the Sino-Russian-Iranian bloc is measuring up against what’s left of the United States-led alliance system.

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The P4 laboratory, on the campus of the Wuhan Institute of Virology, in Wuhan, in China's central Hubei province. (Hector Retamal/AFP via Getty Images)