Russian officials say Biden decision to let Ukraine fire missiles deep into Russia could lead to world war

President Biden's decision to allow Ukraine to fire U.S.-made and supplied missiles deeper into Russia — a major policy shift announced over the weekend after months of intense lobbying by Kyiv — has drawn a furious response from Moscow. While there was no immediate reaction directly from the man who launched the nearly three-year war on his neighboring nation, lawmakers aligned with President Vladimir Putin in Russia said Monday that the move was unacceptable and warned it could lead to a third world war.

Mr. Biden authorized Ukraine's President Volodymyr Zelenskyy to use American-made missiles with a range of almost 200 miles, known as ATACMS, to strike deeper inside Russian territory than the Ukrainians have to date. 

So far, Ukraine's attacks beyond the immediate border region inside Russia have been limited to non-U.S. — and much less potent—  weapons such as explosive drones. ATACMS are far more destructive and harder to shoot down as they head for their programmed targets.