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"I have lodged a lawsuit with the Supreme Court to invalidate a presidential decree on the early termination of the SBI director's powers. My dismissal was a political decision that appeared as a result of the implementation of scenarios of various groups. It will be possible to assess its effect over time. However, there must be a legal decision," he wrote on Telegram.

Read alsoUkrainian prosecutors open pretrial probe into ex-chief of SBI Truba – lawmaker

Truba said his work at the SBI had become the pinnacle of his professional career, therefore, in his opinion, his early dismissal should receive not only a political but also a legal assessment.

As UNIAN reported earlier, the Verkhovna Rada on December 3 passed a draft law to amend certain laws of Ukraine to streamline the SBI's work. Under the law, the SBI's incumbent director and deputies must be fired.

New senior officials of the SBI will be selected by a commission, which will include three members from parliament, three from the president, three from the government. The government's quota will be delegated by international organizations.

On December 27, Ukrainian President Volodymyr Zelensky dismissed Truba and appointed Iryna Venedyktova as Acting SBI Director.