Ukrainian strikes on Russian rear areas are "demonstrably degrading" the morale of Russian forces in Ukraine, and this "could threaten the stability of Russian defenses on multiple critical areas of the front," the ISW said.... The ISW said morale issues can quickly intensify and spread among Russian frontline units if one unit under pressure breaks, which in turn could "spread panic" and "significantly reduce the combat effectiveness of other Russian forces." "A broken Russian frontline unit would threaten the integrity of other frontline defenses, and such a break in the Russian frontline would provide a vulnerability that Ukrainian forces could...