Russia's Advancements in Warfare and Ukraine's Counteroffensive.

Russia has improved its weaponry and skills in the 15-month-old war in Ukraine, building heavily fortified defenses, honing its electronic weapons, and turning heavy bombs from its massive Cold-War-era arsenal into precision-guided gliding munitions capable of striking targets without putting its warplanes at risk. The changing Russian tactics, along with increased troop numbers and improved weaponry, could make it challenging for Ukraine to score any kind of quick decisive victory, threatening to turn it into a long battle of attrition.