U.S. stock index futures on Tuesday fell amid geopolitical concerns triggered by developments in the ongoing war between Russia and Ukraine. Safe haven assets such as Treasury yields, gold and the Japanese yen rallied.

U.S. stock index futures fell on Tuesday as worries about escalating tensions between Russia and Ukraine affected risk sentiment globally, with investors rushing to safe-haven assets. President Vladimir Putin said Russia could consider using nuclear weapons if it was subject to a conventional missile assault supported by a nuclear power,

European stock markets slid Tuesday on fears of escalation in the Russia-Ukraine war after President Vladimir Putin broadened rules on his country's use of nuclear arms, analysts said.

Oil prices edged up on Monday after fighting between Russia and Ukraine intensified over the weekend, although concerns about fuel demand in China and forecasts of a global oil surplus weighed on markets.

Crude futures press higher as the market considers risks of escalation in the Ukraine-Russia conflict after Biden approved Ukraine's use of U.S.-supplied long-range missiles that could strike deeper into Russia.

Moscow’s full-scale invasion of Ukraine roiled global energy markets in 2022 as European nations sought to end their dependence Russian natural gas.