Tit-for-tat moves this week included the use of American-made ballistic missiles to strike inside Russia, and new nuclear threats from Moscow. Neither appear to have influenced the war on the ground.

The Ukrainian military has a new weapon in its arsenal, as President Joe Biden has given permission for Ukraine to begin firing U.S.-made ATACMS missiles into Russia. The Ukrainians wasted no time and shot at least six of these missiles at a weapons facility in Russia's Bryansk region,