The missile that once ended a Cold War treaty is back — and it’s firing again. Ukraine has confirmed Russia used the INF-banned 9M729 missile 23 times since August, reviving a weapon that led Donald Trump to quit the Intermediate-Range Nuclear Forces Treaty in 2019. The missile can carry a nuclear or conventional warhead and strike targets up to 2,500 km away. Western analysts say Moscow’s move threatens Europe’s security and pressures Trump’s ongoing peace efforts. With Russia also testing Burevestnik and Poseidon, the nuclear arms race just got real again.