Urban combat continues in Kostiantynivka; Zaporizhzhia nuclear plant loses external power again

Ukrainian forces are engaged in urban combat in Kostiantynivka, clearing enemy personnel, according to a battalion commander who stated the city is "semi-encircled" due to Russian advances near Chasiv Yar and Berestky. The Institute for the Study of War (ISW) suggests Russia's main Donbas offensive focus has shifted to Kostiantynivka from Sloviansk. Separately, the Zaporizhzhia Nuclear Power Plant lost external power for the 19th time on June 10, around 9 PM, following an attack on an electrical substation. Energoatom confirmed the "ZaTES – Ferrosplavna №1" power line disconnected, prompting a switch to backup diesel generators, an event also reported by the IAEA. Additionally, Commander-in-Chief Oleksandr Syrskyi stated Ukrainian drone units struck nearly 180,000 Russian targets in May, maintaining a 1.5 to 1 FPV drone advantage. Sources: Громадське, Радіо Свобода