That figure is more than the amount of territory Russia has seized in Ukraine so far this year. AdvertisementThat's a rate of more than 1,100 casualties a day, and there are indications Russian forces are continuing to take heavy losses. A pair of Ukrainian soldiers walk in the Ukrainian-controlled city of Sudzha in Russia's Kursk region. But he said there's also a danger that Ukraine's forces could get overextended and "get too widely spaced that the Russians can take advantage of it." Furthermore, this unexpected invasion of Russian territory has allowed Ukraine to regain the initiative after months in a grueling defensive position.

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Persons: —, Volodymyr Zelenskyy, Fabien Nachi, Matthew Savill, David Cohen, Michael Bohnert, Savill, Ed Ram, Mark Cancian, there's, Cancian, Vladimir Putin Organizations: Service, Business, NBC, Getty, Royal United Services Institute, UK Ministry of Defence, Russia, Ukraine, CIA, RAND Corporation, Washington, Marine, Center for Strategic, International Studies Locations: Russia's Kursk, Russia, Ukraine, Kursk, Sudzha, Ukrainian