KYIV, Dec 14 (Reuters) - Ukrainian atomic energy agency Energoatom said on Wednesday it would offer higher bonuses to staff at the Russian-occupied Zaporizhzhia nuclear power station who remain loyal to Kyiv."In addition, from January 1, Energoatom is also increasing from 20% to 50% the bonus for ZNPP personnel who stay loyal to Ukraine."Russian President Vladimir Putin issued a decree in October transferring the Zaporizhzhia plant from Energoatom to a subsidiary of Rosatom in what Kyiv said amounted to theft.The plant is located in the Ukrainian region also called Zaporizhzhia, one of four regions Putin says he has incorporated into Russia - a move condemned by Kyiv as an illegal land grab.Before Russia's invasion, the plant produced about one-fifth of Ukraine's electricity and nearly half the energy generated by the country's nuclear power facilities."