MOSCOW — Amid escalating U.S.-Russia tensions, the Russian military said Tuesday it will cooperate with China on efforts to fend off a threat posed by the U.S. missile defense program.

Lt. Gen. Viktor Poznikhir of the Russian military’s General Staff accused the Pentagon of developing the shield as part of planning for a possible first nuclear strike. “The missile defense system considerably shifts the balance of offensive weapons, allowing the planning of a more efficient pre-emptive strike,” he said at a security conference in China.

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