Multiple outlets report that Russia’s defence ministry claims Russian forces have captured Kostiantynivka in eastern Ukraine. Yahoo News and Investing.com both state that Russian officials say the city is now under Russian control, while Al Jazeera similarly reports the claim that Kostiantynivka—described as strategically important—is captured. The reports present the development as a Russian assertion rather than independently verified confirmation by Ukrainian authorities or independent monitors in the provided text. No additional details are included across the sources here regarding the timeline of the fighting, the scale of territorial changes, casualties, or the conditions on the ground. The accounts focus on the same central point: Russian forces claim to have taken control of Kostiantynivka amid the ongoing war in eastern Ukraine. As with other battlefield claims, the information reflects statements from Russian sources as reported by the outlets, without further corroborating evidence in the supplied summaries.