More than 100,000 soldiers have been charged under Ukraine’s desertion laws since Russia invaded in 2022, according to the country’s General Prosecutor. Desertion is starving the Ukrainian army of desperately needed manpower and crippling its battle plans at a crucial time in its war with Russia. Facing every imaginable shortage, tens of thousands of Ukrainian troops, tired and bereft, have walked away from combat and front-line positions to slide into anonymity, according to soldiers, lawyers and Ukrainian officials. Entire units have abandoned their posts, leaving defensive lines vulnerable and accelerating territorial losses, according to military commanders and soldiers. Some take...