Russia warns NATO of consequences after Putin's nuclear threat

Tensions between Russia and NATO have escalated following President Vladimir Putin's warning about nuclear strikes. Russia's spy chief, Sergei Naryshkin, stated that NATO countries aiding Ukraine with long-range weapons would face punishment. Putin has lowered the threshold for nuclear response amid accusations that Ukraine used U.S. missiles to strike Russian territory. The U.S. has not confirmed these claims but emphasized that Russia is responsible for the ongoing conflict. In response to the heightened threat, the U.S. has closed its embassy in Kyiv and advised citizens to prepare for potential air attacks. The Kremlin has not commented on these developments.