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A swift Ukrainian incursion into Russia's Kursk region was the largest such cross-border raid by Kyiv's forces in the nearly 2½-year war, exposing Russia's vulnerabilities and dealing a painful blow to the Kremlin.
The surprise foray has prompted thousands of civilians to flee the region as the Russian military struggles to repel the attack.
For Ukraine, the cross-border raid offers a much-needed boost to public morale at a time when the country's undermanned and under-gunned forces have faced relentless Russian attacks along the more than 1,000-kilometer (621-mile) front line.
Here is a look at the Ukrainian raid and its implications.
How did the Ukrainian attack unfold?
Kyiv's troops poured into the Kursk region from several directions early Tuesday, quickly overwhelming a few checkpoints and field fortifications manned by lightly armed border guards and infantry units along the region's 245-kilometer (152-mile) frontier with Ukraine.
Unlike previous raids conducted by small groups of Russian volunteers fighting alongside Ukrainian forces, the incursion into the Kursk region reportedly involved units from several battle-hardened Ukrainian army brigades.
Russian military bloggers reported that Ukrainian mobile groups comprised of several armored vehicles each quickly drove dozens of kilometers into Russian territory, bypassing Russian fortifications and sowing panic across the region.
The Institute for the Study of War, a Washington-based think-tank, said Ukrainian forces have managed to push up to 35 kilometers (almost 22 miles) deep into the region. "Ukrainian forces appear to be able to use these small armored groups to conduct assaults past the engagement line due to the low density of Russian personnel in the border areas," it said in an analysis of the raid.
The Ukrainian forces have widely used drones to strike Russian military vehicles and deployed electronic warfare assets to suppress Russian drones and derail military communications.
While small Ukrainian mobile groups roamed the region without trying to consolidate control, other troops reportedly have started digging in around the town of Sudzha about 10 kilometers (6 miles) from the border and in some other areas.
How has the Russian military responded?
Caught off guard, Russian troops failed to mount a quick response to the incursion. With the bulk of the Russian army engaged in the offensive in Ukraine's eastern Donetsk region, few troops were left to protect the Kursk border region. The Russian units along the frontier consisted mostly of poorly trained conscript soldiers, who were easily overcome by elite Ukrainian units. Some conscripts were captured.
The manpower shortage prompted Russian military command to initially rely on warplanes and helicopter gunships to try to stem the Ukrainian attack. At least one Russian helicopter was downed, and another one was damaged by the advancing Ukrainian forces, according to Russian military bloggers.
Russian reinforcements, including elite special forces units and hardened veterans of the Wagner military contractor, later started to arrive in the Kursk region, but they so far have failed to dislodge the Ukrainian forces from Sudzha and other areas near the border.
Some of the newly arriving troops lacked combat skills and suffered casualties. In one example, a convoy of military trucks carelessly stopped on the roadside near the combat area and was pummeled by Ukrainian fire.
The Russian Defense Ministry declared Friday that Ukraine lost 945 soldiers in four days of fighting. The claim couldn't be independently verified. The ministry didn't offer any data on Russian casualties.
What did Ukrainian authorities say about the incursion?
Ukrainian officials have refrained from commenting on the cross-border raid. In a video address to the nation late Thursday, Ukrainian President Volodymyr Zelenskyy avoided directly mentioning the fighting in the Kursk region. But he said that "Russia brought the war to our land, and it should feel what it has done."
Zelenskyy adviser Mykhailo Podolyak said Thursday that cross-border attacks will cause Russia to "start to realize that the war is slowly creeping inside of Russian territory." He also suggested such an operation would improve Kyiv's hand in any future negotiations with Moscow.
"When will it be possible to conduct a negotiation process in a way that we can push them or get something from them? Only when the war is not going on according to their scenarios," he said.
What did the Kremlin say?
Russian President Vladimir Putin has described the incursion as a "large-scale provocation" that involved "indiscriminate shelling of civilian buildings, residential houses and ambulances."
Russian authorities said at least five civilians, including two ambulance workers, have been killed in the Ukrainian attack on the Kursk region and nearly 70 others have been wounded.
Dmitry Medvedev, deputy head of the Putin-chaired Security Council, said the Ukrainian raid emphasized the need for Moscow to expand its war goals to capturing more of the Ukrainian territory, including the capital of Kyiv, the Black Sea port of Odesa and other major cities.
Russia has declared a federal emergency in the Kursk region, giving local authorities more powers to quickly coordinate an emergency response. Russian state propaganda focused on the Kremlin's efforts to provide assistance to displaced residents while playing down the military's unpreparedness for the attack.
What are Ukraine's goals and how could the situation unfold?
By launching the incursion, Kyiv could be aiming to force the Kremlin to divert resources from the eastern Donetsk region, where Russian forces have pressed offensives in several sectors and made slow but steady gains, relying on their edge in firepower.
Coming at a time when Kyiv's forces are struggling to stem the Russian advances in the east, the swift raid shows Ukraine's ability to seize the initiative. It has also dealt a blow to the Kremlin, highlighting its failure to protect the country's territory and shattering Putin's narrative that Russia has remained largely unaffected by the hostilities.
But despite the initial successes, the foray into Russia could cause attrition in some of Ukraine's most capable units and leave troops in Donetsk without vital reinforcements.
Trying to establish a lasting presence in the Kursk region could be challenging for the Ukrainian forces, whose supply lines would be vulnerable to Russian fire.