New START, which replaced START I in 2011 and required even deeper cuts, was the last remaining bilateral treaty putting any legal and verifiable constraints on the US and Russian nuclear arsenals, expired on February 5, 2026.
Stephen SchwartzToday in 2010, President Barack Obama and President Dmitry Medvedev signed the New Strategic Arms Reduction Treaty in Prague, Czech Republic. New START—which expired on February 5—limited each country to 1,550 deployed strategic warheads and a combined total of 700 ICBMs, SLBMs, and bombers.