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New START Expires Thursday, Ending U.S.–Russia Nuclear Limits

The Kremlin says it will act responsibly after expiry, with no U.S. response to its one‑year limits proposal.

Overview

  • The lapse removes binding caps and on‑site verification for the world’s two largest nuclear arsenals for the first time in more than half a century.
  • Putin, via aide Yuri Ushakov, reiterated an offer to voluntarily observe current limits for one year if Washington reciprocates, but the White House has not formally replied.
  • President Donald Trump has signaled willingness to let the pact end while pursuing a broader agreement that includes China, which has refused to join such talks.
  • Kremlin figures Dmitry Peskov and Dmitry Medvedev warn the situation will become more dangerous, as deputy minister Sergei Ryabkov says Russia is ready for a no‑limits reality.
  • Arms‑control advocates and experts warn both sides could upload hundreds of warheads and fuel a multi‑power arms race, with ICAN and Pope Leo XIV urging restraint and Germany faulting Moscow for the breakdown.