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The impact of Ukraine's surprise Kursk battle and Russian efforts to counter it turn on the strained Russian railroad network.
Russia may not run out of weapons and men anytime soon, but it can't sustain its level of aggression for long, Michael Kofman said.
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A Ukrainian drone takes flight with a package. A phone screen shows the logo of gaming messaging platform Discord.
Russian and Ukrainian troops have been using Discord to coordinate drone attacks. It was banned on Tuesday by Moscow.
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A woman and a child walk past a New Year decoration of a Kremlin Star bearing the letter Z, an insignia for Russian troops in Ukraine, in the winter.
Russia is set to lose 1,000 men per day in the winter as it pushes hard to take territory in Kursk, Kharkiv, and eastern Ukraine, according to UK military intelligence.
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Russian Beluga whale spy
A white beluga whale wearing a harness is seen off the coast of northern Norway, April 29, 2019.
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Blindfolded men in uniforms sit in a covered facility.
Ukraine posted footage of men in uniforms being held by its troops, saying it seized over 100 Russian soldiers who surrendered in Kursk.
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Ukrainian tank crew take a break while operating a Soviet-made T-72 tank in the Sumy region.
Ukraine stormed into Kursk on August 6, and its audacious attack's early success has raised questions about Russia's intelligence and preparedness in the region.
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In this photo taken from video released by the Russian Defense Ministry on Friday, Aug. 9, 2024, soldiers sit in a  military truck as a column of the Russian Armed Forces move to build up forces conducting active combat operations with Ukrainian formations in the Sudzhansky district of Kursk region of Russia. One solider waves at the camera.
Russian soldiers being rushed to Kursk's Sudzhansky district during Ukraine's incursion.
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Putin sits at a desk in the Kremlin while on a remote call with officials from Kursk.
Officials say Russian leader Vladimir Putin, pictured here attending a remote meeting from Moscow, has been personally overseeing the response to Ukraine's attack in Kursk.
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Rural houses are damaged by shelling and fighting in Kursk.
Kursk's acting governor, Alexey Smirnov, posted photos of towns in the region damaged by the fighting after Ukraine launched a rare incursion past the border.