Ukrainian forces have captured more than 240 Russian soldiers since their surprise invasion of Russia’s Kursk region this month, according to an analysis of visual evidence that includes mass detentions of young troops appearing to surrender without resistance. The Washington Post reviewed more than 130 photos and videos taken since the incursion began Aug. 6, most of which appear to have been filmed by Ukrainian soldiers and shared on social media. The analysis also included photos taken by a Post photographer at a prison housing captured Russian soldiers in Ukraine. The verified visuals depict at least 247 Russian prisoners and...