BILD writes about it.
According to military observer Julian Röpke, the Russian forces attacked the village of Velyka Pysarivka in Sumy region with such a warhead.
According to an analysis of open data, a 1 km-high cloud of smoke rose into the sky after the bomb hit.
"The use of a 1.5-tonne bomb in the village Röpke called 'a new bottom in Russia's war against Ukrainian cities,'" the statement said.
Reference. An ODAB (volume-detonating aircraft bomb) is a thermobaric bomb from the Soviet era that releases a flammable liquid in the form of an aerosol about 10 metres before hitting a target and ignites it.
This is called a volumetric explosion. Such a munition has a greater destructive power than the classical one. Previously, the Russian army used such bombs, but they were of the smallest weight: from 170 to 500 kg.