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"A quick decision made after the publication of the so-called 'Kyiv District Administrative Court recordings,' including in relation to decision-making by the Constitutional Court of Ukraine is another step towards the destruction of the institutional independence of the National Bureau," NABU said in a statement on August 29.

In addition, according to NABU, the Constitutional Court of Ukraine deprived NABU of the authority to invalidate illegal agreements in court and actually released the officials from criminal liability for illegal enrichment.

Read alsoUkraine State Judicial Administration, Kyiv District Administrative Court's heads served with charge papers – NABUIt is reported next in line is the consideration of the constitutional petition filed by the Members of Parliament on the alleged unconstitutionality of the establishment of the National Bureau. The initiators of these petitions, as well as the draft laws, which over the past five years had the goal of weakening NABU in relation to the investigation of top corruption, were the persons involved in the corrupt schemes, including those who already have the status of suspects or accused.

NABU director's appointment: essence of claim

On July 9, 2020, the Constitutional Court launched consideration of the claim filed by a group of 51 people's deputies who asked the court to look into the constitutionality of the presidential decree on appointing Artem Sytnyk NABU Director.

According to the law on NABU (Part 9 Article 7), a president appoints a Bureau director from among two to three candidates selected by the competition committee.

In 2015, of 176 candidates running for the top post at NABU, Arem Sytnyk and Mykola Siriy reached the final stage of selection. The then-President Petro Poroshenko has appointed Artem Sytnyk.

The group of deputies, which includes Vladimir Putin's political operative in Ukraine Viktor Medvedchuk, explained in their filing with the Constitutional Court that the post of NABU director is beyond the explicit list of positions laid down in the Constitution to which a president is entitled to appoint officials.

They believe that the president thus breached the ban on usurping state power, enshrined in Part 4 Article 5 of the Constitution.

On August 28, the Constitutional Court of Ukraine ruled that the appointment of Sytnyk as NABU Director was unconstitutional.

What is NABU

The agency was established in 2014 after its predecessor, the National Anti-Corruption Committee was considered a failure. The Bureau was created on the request of the International Monetary Fund, according to Wikipedia.

The agency's government funding is mandated under American and European Union aid programs. It has an evidence-sharing agreement with the FBI.