Institute for the Study of War (ISW)
The Institute for the Study of War (ISW) is an American think tank based in Washington, D.C., founded in 2007. It focuses on defence and security policy, with particular attention to armed conflicts and military operations. Since Russia's full-scale invasion of Ukraine in 2022, the institute has produced daily assessments of the war that have become a widely cited source for Western governments, media and military analysts.
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Ukraine's Third Army Corps confirms "Vivaldi" offensive near Lyman
Ukraine's Third Army Corps publicly confirmed on September 15 that it has been running an offensive operation codenamed "Vivaldi" in the northern part of Donetsk Oblast, east and northeast of Lyman. The corps revealed details of the first phase, which targeted Russian troop infiltration and logistics, and reported Russian losses in personnel, drones and equipment. The announcement broke months of operational secrecy around the fighting.