A string of political victories and deep-strike successes by Ukraine has revived hopes that the war could be shifting in Kyiv's favor, though analysts warn that efforts to raise the conflict's cost for Russia risk triggering further escalation. After more than four years since Russia's full-scale invasion, Ukraine launched an unprecedented drone strike on Gazprom's Moscow Refinery, triggering a huge explosion and sending black plumes of smoke billowing into the sky over the Russian capital. The