According to the U.S. law enforcement agency, in June 2016, the FBI and NABU adopted a Memorandum of Understanding, which allows the FBI to assist NABU and the Special Anti-Corruption Prosecutor's Office (SAP) in the investigation and development of these agencys. The FBI adhered to the laws of Ukraine and never operated beyond the framework defined by the Memorandum.
The FBI said that its members worked in the NABU on a temporary, rotational basis to support the relations between the agencies.
The American law enforcement agency stressed that these special agents and analysts were not operational while any suggestions to the contrary were false.
The agency also said that the eradication of corruption was a priority for the FBI and it was constantly cooperating with its partners in law enforcement agencies around the globe to investigate corruption and provide assistance when requested.
Later, the FBI added that all the law enforcement agencies should work together in the fight against corruption.
Earlier, Prosecutor General Lutsenko accused Sytnyk of NABU’s involvement in unlawful FBI operations in Ukraine.
On Nov. 29, the press office of the State Migration Service reported detention of the NABU member - the son of the former member of the Party of Regions Yurii Boiarskyi - while trying to bribe First Deputy Head of the State Migration Service of Ukraine Dina Pimakhova. NABU later said that the PGO and SBU unlawfully intervened in the undercover operation. The SBU conducted a search and seizure operation in the NABU on the same day.