MOSCOW/KIEV (Reuters) - Ukraine must investigate the activities of U.S. presidential candidate Joe Biden’s son to establish whether his role in a Ukrainian gas company complied with the country’s laws, Mykola Azarov, Ukraine’s former prime minister, said in an interview.

Azarov did not specify to which Ukrainian laws he was referring.

Hunter Biden’s role in the company, Burisma Holdings Limited, is in focus after the White House released a memo showing U.S. President Donald Trump asked his Ukrainian counterpart, Volodymyr Zelenskiy, in a July phone call to get prosecutors to look into his activities. Zelenskiy agreed.

“It’s a fact (his directorship and fees) and not made up. It should be investigated so that the ‘i’s can be dotted and the ‘t’s crossed,” Azarov told Reuters.

A spokesperson for Joe Biden’s campaign declined to comment on Azarov’s investigation call and none of Hunter Biden’s critics have provided any evidence that he broke Ukrainian law.

Ukraine’s National Anti-Corruption Bureau has said it is investigating activity at Burisma between 2010-2012, but that it is not looking into changes to its board in 2014, when Hunter Biden joined.

Democrats in the U.S. House of Representatives are pursuing an impeachment inquiry against Trump, a Republican, after a whistleblower complained about his call with Zelenskiy.

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Lawmakers are looking into whether Trump’s actions jeopardized national security and the integrity of U.S. elections, saying he appeared to be soliciting a political favor from a foreign leader to get re-elected.

Azarov lives in Moscow, but says he remains well-connected with parts of Ukraine’s political establishment, adding he would like to return one day.

Hunter Biden was a director on Burisma’s board from 2014 until at least 2018, according to documents filed by the company in Cyprus, where it is registered.

INTERPOL

Azarov, who was prime minister from 2010-2014, is himself wanted by Ukrainian authorities. An Interpol red notice issued in 2015 at the request of Ukrainian authorities cited accusations, including embezzlement and misappropriation.

Interpol canceled that red notice in 2017 after Azarov successfully challenged it, according to an Interpol document viewed by Reuters. Interpol said it did not comment on individual cases.

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Azarov has denied any wrongdoing.

Reuters cannot determine whether there is any active investigation into Azarov in Ukraine. A spokesman for Azarov said he was no longer regarded as a suspect by Ukrainian authorities, though a notice on the Ukrainian Interior Ministry’s website updated on Friday said he was still wanted by the country’s security service.

Azarov said he was not aware of any evidence suggesting wrongdoing on Hunter Biden’s part, but said it was in the Ukrainian public interest to ascertain the legality of his activities.

In particular, he said it was important to investigate what Biden had done for Burisma to justify his remuneration from Burisma.

The younger Biden has said he consulted for Burisma, but critics have suggested he was not doing actual work in return for his compensation, an allegation he denies.

“I think it’s essential (he’s investigated),” Azarov told Reuters in Moscow, where he fled after street protests toppled Russia-friendly President Viktor Yanukovich in 2014.

“If, using his knowledge, he played an active role then there’s nothing scandalous about it,” Azarov said. “But if he was simply on the books and getting money, then that could be seen as a violation of the law.”

Burisma was not available for comment.

Ukrainian prosecutors have said they are not investigating Hunter Biden, but are looking into the legality of Burisma’s activities before Biden joined its board. Burisma, which denies any wrongdoing, has faced allegations of dodging taxes and of improperly securing licenses for gas deposits.

Azarov said that he believed allegations from Trump lawyer Rudy Giuliani and others that Joe Biden had gotten Ukraine’s prosecutor general fired to protect his son Hunter were “absolute nonsense” but must also be investigated.

He did not provide the basis for his views.

The former U.S. vice president has denied using his influence in 2016 to get Ukraine’s then-prosecutor general, Viktor Shokin, fired to prevent him investigating his son’s involvement and has said he and his son have done nothing wrong.