RBK-250 is a Russian 250 kg
cluster bomb
A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill personnel and destroy vehicl ...
. Bomb dimensions are 2.3 m length by 0.4 m across, holding multiple bomblets. Each bomblet is 33 cm long, weights 2.8 kg and carries 500 g of explosives.
[The New York Times, 21 December 2012]
Cluster bombs in Syria
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References
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Cluster munition
Aerial bombs of Russia