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.

After U.S. President Joe Biden gave the go-ahead for Ukraine to wield long-range American missiles deep inside Russia, as a Newsweek map illustrates, questions remain over just how much of a difference this will make as Moscow gains in the east and a new U.S. presidential term approaches.