Western countries have gone out of their way NOT to provide the Ukrainians with weapon systems capable of striking Russia directly. So they are building their own.
This will not change the tides of war overnight, especially since Russia has never backed down from a fight without losing at least half a million men first. However, it does present an interesting opportunity for the Ukrainians.
By targeting Russia's nexus points (i.e., oil refineries), the Ukrainians could eliminate Putin's economic ability to sustain its military complex. Then we'll have a much more interesting conversation to have.