U.S. stock futures and bond yields have dropped following reports that Russian President Vladimir Putin has updated the country's nuclear doctrine, expanding the conditions under which Russia could use atomic weapons. This development has led to a rally in safe-haven assets, with investors moving towards currencies and other secure investments. European equities have also declined for a third consecutive day amid concerns about an escalation of Russia's war in Ukraine. The market's reaction reflects heightened geopolitical tensions, with traders closely monitoring developments in the Ukraine conflict. The VIX, a measure of market volatility, has reacted to the nuclear war news.