After months of watching hundreds of new nuclear missile silos being dug in the dirt northwest of Beijing, it is welcome news that President Joe Biden and Chinese President Xi Jinping seemingly agreed at last week’s summit on the need for strategic stability talks. Strategic stability — the idea that nuclear-armed countries should not be able to gain decisive advantage over one another — has taken on new importance as China expands and modernizes its nuclear arsenal.

China is expected to quadruple its number of warheads in the next decade, and is upgrading its nuclear capabilities with new missiles, submarines and bombers. Over the summer, it reportedly fired a missile from a hypersonic glide vehicle while testing its fractional orbital bombardment system (FOBS) — a technical advance that, if true, means the Chinese can attack targets from space with nuclear weapons. Although China insists it will never be the first to use nuclear weapons, this claim has less credence than in the past, when the country’s nuclear force was much smaller.

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