Ukraine saw a series of resignations among top officials Tuesday as Kyiv looks to tamp down on cases of corruption with Ukrainian President Volodymyr Zelenskyy warning more will likely come.

“We have already made personnel decisions – some today, some tomorrow – regarding officials of various levels in ministries and other central government bodies, in the regions, and in the law enforcement system,” Zelenskyy said in his overnight address.

The Ukrainian president did not mention which officials would resign or had been terminated, but according to Reuters a deputy prosecutor general, a deputy defense minister and the deputy chief of staff in Zelenskyy’s office vacated their positions Tuesday morning.