Ukrainian Prosecutor General Ruslan Riaboshapka has said the Prosecutor General's Office (PGO) has started legal due diligence of cases, including the one involving Burisma Holdings Limited, a company whose board former U.S. Vice President Joe Biden's son, Hunter Biden, joined in 2014.

"Firstly, I have already said that we are conducting an audit of those proceedings that were previously carried out by prosecution authorities, including the Prosecutor General's Office. In the case of which you speak, in which (Mykola) Zlochevsky, (Serhiy) Kurchenko and other people or companies may be involved, there are about a dozen such proceedings. But we are reviewing all cases that were closed, split, or investigated earlier to make decisions in cases where illegal, procedural decisions were previously made so that we revise them," he told a briefing in Kyiv, answering a question whether the PGO plans to reopen the "Burisma case" and bring to justice those involved, according to an UNIAN correspondent.

Read alsoUkraine's anti-graft agency probing Burisma's activity before Biden's son joined supervisory board

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UNIAN memo. Ukrainian authorities have been probing into money laundering in the amount of over US$33 million during the acquisition of a group of companies of Kherson oil transshipment, in which Wirelogic Technology AS, Digitex Organization LLP, and ex-Minister of Ecology, businessman Mykola Zlochevsky's Burisma Holdings Limited were involved. Hunter Biden, son of former U.S. Vice President Joe Biden, was a member of the latter's board.

On May 14, the then Prosecutor General, Yuriy Lutsenko, said that Ukraine was ready to transfer materials on Burisma to U.S. law enforcement agencies. According to him, the investigation had a printout of all Burisma payments, including to senior U.S. officials. Yet, Lutsenko emphasized, the foreigners who were involved in the management of Burisma had not violated Ukrainian legislation.

On September 24, after a whistleblower's complaint, the White House unprecedentedly published a redacted version of the memorandum of the July 25 telephone conversation between U.S. President Donald Trump and his Ukrainian counterpart Volodymyr Zelensky, which became the cause behind a formal impeachment inquiry into Trump.

According to the memorandum, Trump repeatedly asked Zelensky to "look into" the situation regarding a probe into former U.S. Vice President Joe Biden's son in Ukraine.

The National Anti-corruption Bureau of Ukraine (NABU) said on September 27 its detectives were probing into Burisma Holdings Limited's activity over possible abuse of office by Ecology Ministry officials before U.S. Vice President Joe Biden's son, Hunter Biden, joined the company's supervisory board.

Deputy Prosecutor General and Chief of the Specialized Anti-corruption Prosecutor's Office (SAPO) Nazar Kholodnytsky said that neither former U.S. Vice President Biden nor his son, Hunter Biden, had been questioned by the Ukrainian authorities by then in the case of possible abuse by Ecology Ministry officials.