China and Russia Turn Deeper Ties into a Military Challenge for Biden

Deepening military and diplomatic cooperation between Russia and China is worrying U.S. defense planners, who fear the two frenemies that share military technology and many foreign-policy goals will complicate the Biden administration’s plan to reassert U.S. leadership.

China is carefully monitoring Russia’s military buildup near the border with Ukraine, which the U.S. Defense Department said this week is larger than the 2014 deployment, with an eye to its own pressure campaign on Taiwan and the South China Sea. Last week, China dispatched a record number of bombers and fighters into Taiwan’s air defense zone in a display of dominance; top U.S. military officials warn Beijing could try to seize the island by force in the next six years.

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