Institute for the Study of War notes that these gains have come at a "massive cost" in terms of troops and equipment, potentially limiting their ability to conduct more extensive offensive operations in the future.
Russian forces close in on strategic Ukrainian city of Pokrovsk
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Institute for the Study of War said Saturday that Russian forces had recently advanced near Kupiansk, in Toretsk, and near Pokrovsk and Velyka Novosilka, a key logistics route for the Ukrainian military.
Volodymyr Zelenskyy says NATO offer for Ukraine-controlled territory could end 'hot stage' of war
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