Ural Mountains-based firm Fores says it will pay $72,000 to the first soldiers who "capture or destroy" German-made Leopard 2 or US-made Abrams tanks and $215,000 for Western-made fighter jets.
The German foreign ministry's attempts to poke fun at Russia's top diplomat on Twitter during his tour of Africa backfired after it offended Africans.
Chancellor Olaf Scholz had been under criticism for weeks for hesitating to decide on sending the Leopard 2 tanks to Ukraine.
Ukrainian presidential adviser has criticised the "indecision" of its allies on whether to provide modern heavy tanks for its fight against Russia as fighting rolls into its 332nd day.
The Social Democrat politician was against sanctions on Russia in 2014. Now he has to decide whether Germany can send Leopard tanks to help Ukraine challenge Russia.
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