Dagora, the Space Monster

Several satellites are destroyed and only a few days later, a group of diamond thieves find that the gems they stole suddenly disappear. The two incidents are linked as scientists discover giant jellyfish-like creatures, mutated from the high levels of radiation over Japan, are consuming all carbon based matter. The creatures start to attack civilian structures such as bridges and ships. The scientists must find a way to stop the creatures before it's too late.

In my opinion I wounder where the Jellyfish came from