China has helped Russia revive its military production at a critical stage in its Ukraine war‚ providing Moscow with optics‚ microelectronics‚ drone engines and other dual-use material that have significantly strengthened Moscow’s battlefield capabilities‚ senior Biden administration officials said Friday. In the last quarter of 2023‚ China provided Russia with more than 70% of its nearly $900 million in machine-tools imports‚ which Moscow has likely used to build ballistic missiles‚...