In simpler terms, Russian President Vladimir Putin recently stated that his country would view an attack from a non-nuclear state, backed by a nuclear-armed one, as a “joint attack”. This could be seen as a threat to use nuclear weapons in the ongoing conflict in Ukraine. Putin also mentioned that Russia is considering changing the rules and conditions for using its nuclear arsenal. Ukraine, a non-nuclear state, has received military support from the US and other nuclear-armed countries. They are seeking approval to use long-range Western missiles against military sites in Russia. This request is expected to be discussed during Ukrainian President Volodymyr Zelensky‘s meeting with US President Joe Biden. In response to Putin’s remarks, Zelensky’s chief of staff Andriy Yermak criticized Russia for resorting to nuclear threats. US Secretary of State Antony Blinken also condemned Putin’s comments as “totally irresponsible”. China, a close ally of Russia, has urged for calm and reports suggest that Chinese President Xi Jinping has warned Putin against using nuclear weapons. However, Putin has announced plans to expand Russia’s nuclear doctrine, stating that they would consider using nuclear weapons if they detect a massive launch of missiles, aircraft, and drones into their territory. He also proposed that any aggression against Russia by a non-nuclear state, with the support of a nuclear state, would be considered a joint attack on Russia. Putin emphasized that their nuclear arsenal is crucial for the security of their country and citizens. This is a departure from the traditional policy of deterrence, where nuclear-armed states rely on the threat of mutually assured destruction to prevent major nuclear strikes. Russia also possesses tactical nuclear weapons, which are smaller warheads designed for specific targets without causing widespread radioactive fallout. In June, Putin warned European countries supporting Ukraine that Russia has more tactical nuclear weapons than the entire European continent, even if the US brings their own.