Nukes Vs Nukes: Why U.S-NATO should worry more about Putin's nuclear threat

Russia's pledge to use "all means" to defend itself amid war with Ukraine has spooked the world. Putin stated that he will use "all means at our disposal" to defend its territory, which is now interpreted as a "nuclear threat" to countries not to escalate their involvement in Ukraine. According to the Federation of American Scientists, Russia has 5,977 nuclear warheads, more than NATO's combined nuclear weapons. Watch this video to know more.