Nathan Gill was at Manchester airport, about to board a flight to Russia, when accepting bribes finally caught up with him.

Gill, the former leader of Reform UK Wales and a one-time member of the European Parliament, who on Friday was jailed for 10-a-half-years, was stopped by police before boarding and had his phone seized in 2021.

While they interrogated him, his home in Anglesey was raided, with detectives discovering more electronics and cash piles of €5,000 (£4,400) and $5,000 (£3,800) respectively.

The evidence on Gill's phone would damn him – he was in contact with a pro-Russian politician in Ukraine, Oleg Voloshyn, and had agreed to boost pro-Russia viewpoints in exchange for money.

Voloshyn would dictate the statement, and Gill would repeat it – in some cases, almost word for word – in the media or the European Parliament.

In one instance, Gill appeared on the now-banned Ukrainian TV channel, 112 Ukraine, which was known for its pro-Russian stance.

In the interview, he was critical of the Ukrainian decision to open criminal proceedings against Viktor Medvedchuk, the owner of the television channel and a personal friend of Vladimir Putin.

Speaking to the outlet, he said he was "very concerned" about the investigation, and wondered whether it was meant to silence "opposition politicians".

Prosecutors said messages on Gill's phone showed that this was at his paymaster's instruction, with Voloshyn offering a "reward" if he would say that it was unacceptable to persecute a person for their political convictions.

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Voloshyn also offered the MEP €2,000 (£1,750) if he would express concern that Mr Medvedchuk could no longer mediate with Russia on Ukraine's behalf, the court heard.

He added that "V" – understood to be Mr Medvedchuk – did not believe Ukrainian President Volodymyr Zelenskyy had "true intentions to pursue a peace agenda", prosecutors said.

Sure enough, Gill appeared on 112 Ukraine saying it was "very sad" that Mr Medvedchuk felt he no longer had Mr Zelensky's backing to act as a mediator with Russia, and suggested that using him "would be a sensible thing to do".

The messages traded in innuendo, referring to the exchange of "Xmas gifts" or "postcards" instead of money.

But as the pair grew more comfortable with each other, they bargained more explicitly, with the sum of "£5k" quoted for Gill's work.

Dominic Murphy, head of Counter Terrorism Command at the Met Police, said Gill had also offered access to other MEPs.

"This is where we get into that slightly odd situation where it feels very much like a real effort to undermine democracy here," he said.

"This is Nathan Gill reaching out to individuals that he knows, who are Brits, who might be willing to be paid to go and make speeches."

Commander Murphy declined to name names, but said there was an ongoing investigation and that other people had been spoken to.

None of the pro-Brexit MEPs Gill allegedly approached have been interviewed under caution.

Police confirmed there was no evidence to suggest Reform UK leader Nigel Farage was involved.

Gill was stopped at Manchester Airport on 13 September 2021, under schedule 3 of the Counter Terrorism and Borders Security Act 2019.

He offered police no explanation for his actions and answered no comment in a March 2022 police interview.

But the 52-year-old is believed to have had financial problems.

Mr Murphy added that while Gill appeared to have pro-Russian sympathies, he was primarily motivated by money.

The ex-MEP has been jailed for 10-and-a-half years after pleading guilty to eight counts of bribery between December 2018 and July 2019.

Following an investigation by counter-terrorism police, officers said they believe Gill likely took a minimum of £40,000 in cash and was offering to introduce other British MEPs so they could be bribed.

Voloshyn was picked up by the authorities on a trip to the US in 2021, which enabled the FBI to discover his end of the conversation.

He is now believed to be in Russia, but has been sanctioned by the UK government over allegations of trying to destabilise Ukraine.

He remains wanted in both Britain and Ukraine.

A Reform UK spokesman said: "Mr Gill's actions were reprehensible, treasonous and unforgivable.

"We are glad that justice has been served and fully welcome the sentence Nathan Gill has received."

Mr Farage, the Reform UK leader, said: "An investigation into Russian and Chinese influence over British politics would be welcome."

The MP for Clacton previously described his former colleague as a "bad apple" and said he was "shocked" after Gill pleaded guilty to eight counts of bribery.

He said: "Any political party can find in their midst all sorts of terrible people.

"You can never, ever guarantee 100% that everyone you meet in your life, you shake hands with in the pub, is a good person."