“Uhhh, they weren’t doing this before????”
Should have been, but probably not as their top priority as the Western weapons weren’t much of a threat to them, and they appreciated the Western countries needlessly emptying out their armories. And I suspect that they even allowed the war to drag on a bit, for just that reason.
Troops can slack off and get tired. So Sergei Shoigu is lighting a fire under their azzes and demanding that Russian army makes this a priority. To find and destroy the new Ukie long range weaponry. The new howitzers and new HIMAR racked rockets.