But Russia has adjusted during the second phase of the war by hiding its men behind its fearsome artillery. “Russian artillery has been the decisive factor, but only because it’s had to be the decisive factor,” says Mason Clark, a senior analyst and Russia team lead at the Institute for the Study of War. Russia has at least 10 times as many artillery and missile systems as Ukraine, and in some places on the front line the disparity is closer to 20 to 1, former Defense Minister Andriy Zagorodnyuk says. With a range of hundreds of miles Russian missiles can...