The Kremlin warned on Tuesday that the world is heading into a "dangerous" phase as the last nuclear arms control treaty between the United States and Russia will expire on Thursday. The treaty, called New START, is the final agreement from Cold War-era arms control deals. Kremlin spokesman Dmitry Peskov said, "In just a few days, the world will be in a more dangerous position than it has ever been before." Russia offered a one-year extension but has not received any reply from Washington. If the treaty ends, the US and Russia will have no rules to limit or check their strategic nuclear weapons for the first time in decades. Moscow said this will remove the only remaining control over the world's two largest nuclear arsenals. US President Donald Trump said in September that extending New START "sounds like a good idea," but no action followed. Signed in 2010 by Russian President Dmitry Medvedev and US President Barack Obama, the treaty limits each side to 1,550 deployed strategic nuclear warheads. It also limits missile launchers and bombers. The treaty allows on-site inspections and data sharing to build trust. However, Russia paused inspections during the COVID-19 pandemic, accusing the US of blocking inspections on American soil. In 2023, Russia froze its participation but said it will follow the treaty limits voluntarily. Recently, both sides tested new nuclear-capable weapons and increased military signals. The treaty was extended once before in 2021 but cannot be extended again without a new deal. Experts warn this could end over fifty years of nuclear arms control between Washington and Moscow. Without limits, both countries may eventually expand their nuclear weapons amid global tensions. Efforts to replace the treaty face challenges, as the US wants China included, which China rejects, and Russia wants Britain and France included, which they oppose. With no clear solution, global nuclear risks grow as New START expires.