Nearly six months into the war in Ukraine, the Kremlin still refers to its invasion as a “special military operation” while trying to maintain a sense of normalcy at home. But a series of Ukrainian attacks in Crimea, the Black Sea peninsula that President Vladimir V. Putin illegally annexed from Ukraine in 2014, is puncturing that narrative. And as Ukrainian attacks mount in the strategically and symbolically important territory, the damage is beginning to put domestic political pressure on the Kremlin, with criticism and debate about the war increasingly being unleashed on social media and underscoring that even what the...