The continent's most powerful economy and its most powerful military are failing to meet the moment. Russian President Vladimir Putin's recent decision to partially mobilize Russian reservists represents a significant escalation in his war against Ukraine. Over the coming weeks and months, this could inject as many as 300,000 additional Russian troops into the Kremlin's war effort--and just as Ukraine has achieved some battlefield success. Increased Western assistance is vital for Kyiv to leverage and expand its gains and build up defensive positions, before additional Russian forces enter the fight. But not all Western powers have been pulling their weight...