Sky News takes a look at some of the key questions as Moscow accuses Kyiv of planning an attack on its own territory. Foreign news reporter @MikeRDrummond Russia's claims that Ukraine could unleash a "dirty bomb" on its own territory have fuelled speculation that Moscow could be planning a false flag attack. As its forces face a possible rout on the battlefield and Ukrainian troops close in on the key city of Kherson, senior Russian figures have been issuing wild allegations against Kyiv. What are dirty bombs and how dangerous are they? Is all this just a cover for Russia's plans to destroy the Nova Kakhovka dam and buy time for its withdrawing soldiers? Sky News takes a look at some of the key questions. Putin facing 'inevitable defeat' in southern Ukraine - war latest updates What is a dirty bomb and is it a nuclear weapon? A dirty bomb is a conventional explosive device that has been laced with radioactive material. Also known as a radiological dispersal device (RDD), it involves mi