US foreign-policy establishment
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Council on Foreign Relations · United States · New START lapses, ending 50 years of US–Russia arms control
Frames the expiry as the start of an unconstrained era: for the first time since the 1970s no legal cap binds the two arsenals holding most of the world's warheads. Stresses the loss of verification and on-site inspection more than warhead numbers.
“For the first time in over half a century, no legally binding limits constrain the nuclear arsenals of the United States and Russia.”