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MOSCOW (AP) — The American former Marine who is being held in Moscow on spying charges also holds Canadian, British and Irish citizenship.

Both Ireland and the U.K. have asked that their diplomats be allowed to visit Paul Whelan and a Canadian Global Affairs spokesman Richard Walker says consular officials are aware that a Canadian citizen has been arrested in Russia.

Following his detainment in Russia, Global Affairs said in a statement to Global News:

“Consular officials are aware that a Canadian citizen has been arrested in Russia. Due to the provisions of the Privacy Act, no further information can be disclosed.”

WATCH: More information emerges about U.S. citizen detained in Russia on espionage charges

1:28 More information about the U.S. citizen detained in Russia on espionage charges More information about the U.S. citizen detained in Russia on espionage charges

The news that Paul Whelan holds citizenship in multiple other countries adds complexity to an already-murky case. Whelan, the 48-year-old global security director for a U.S. auto parts company, was arrested a week ago in Moscow. At the time, he was identified only as an American.

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His twin brother David Whelan — who lives in Newmarket, Ont. — today urged the U.S. Congress and the State Department to help get his brother freed.

He also released a statement for the family saying they were “very pleased to know that staff of the U.S. Embassy in Moscow have been given consular access to Paul and confirmed that he is safe.”

Russian authorities have released no information about the charges against Whelan, who could face up to 20 years in prison if convicted of spying. Russian media reported Thursday that Whelan had been formally indicted for spying and the Interfax news agency said he denied the allegation.

Britain’s foreign secretary charged that Russia is trying to use him as a pawn in its geopolitical games.

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Whelan’s family says he was in Russia to attend a friend’s wedding. A Russian lawmaker, meanwhile, hinted Friday that the detainee could possibly be swapped for a Russian woman who has pleaded guilty to trying to influence U.S. politics.

Relations between Moscow and London have hit a low point in the wake of Britain’s allegations that Russian military intelligence agents were behind the nerve-agent poisoning of a Russian former double agent and his daughter in the British city of Salisbury in March.

British Foreign Secretary Jeremy Hunt said his government was helping Whelan.

“We are giving him every support we that we can, but we don’t agree with individuals being used in diplomatic chess games,” Hunt said Friday on Sky News. “We are extremely worried about him and his family.”

Whelan’s British citizenship was reported by the U.S. embassy to British officials on Thursday, according to Britain’s Press Association. That was a day after U.S. Ambassador Jon Huntsman Jr. met with Whelan at Lefortovo Prison in Moscow.

WATCH: Britain worried about U.S./UK citizen detained for spying in Russia

0:51 Britain worried about U.S./UK citizen detained for spying in Russia Britain worried about U.S./UK citizen detained for spying in Russia

“He has British citizenship. The British side has sent a request for a consular visit. Work on it is in progress,” the Russian state news agency Tass cited Foreign Ministry spokeswoman Maria Zakharova as saying.

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Ireland’s Department of Foreign Affairs on Friday confirmed that Whelan also holds Irish citizenship and said it also is requesting consular access to him in Moscow.

The nerve agent poisonings in British has scarred U.K.-Russian relations.

Russia has angrily denied involvement in the Salisbury poisonings. The two Russian suspects identified by British authorities, who were spotted on security cameras in Salisbury on the day that former Russian spy Sergei Skripal and Yulia Skripal were poisoned, claim they were businessmen on a short holiday to see the city’s famed cathedral.

READ MORE: British police release video of two suspects in Sergei Skripal poisoning

Britain expelled 23 Russian diplomats in the case, and Russia sent home the same number. Many British allies made similar expulsions, with more than 150 Russian diplomats kicked out overall.

Whelan’s arrest came two weeks after Russian gun-rights activist Maria Butina pleaded guilty in the United States to conspiring to act as a foreign agent by trying to infiltrate conservative circles and the National Rifle Association to influence U.S. politics.

WATCH: Accused Russian spy Butina pleads guilty to conspiracy

1:36 Accused Russian spy Butina pleads guilty to conspiracy Accused Russian spy Butina pleads guilty to conspiracy

Butina has become a cause celebre for Russia — her face is being used as the profile picture on the Foreign Ministry’s Facebook page — and the timing of Whelan’s arrest has led to suggestions that he is being seen as a potential swap for her.

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A top member of Russia’s parliament, foreign affairs committee deputy head Dmitry Novikov, on Friday appeared to suggest that was a possibility once the investigation into Whelan was completed.

“I think that we have to give our special services the opportunity to finalize things with the detainees. Then we will see,” he said, according to the Interfax news agency.

Whelan, a former staff sergeant with the Marines in Iraq, has visited Russia since at least 2007. He is the global security director for the Auburn Hills, Michigan-based BorgWarner, an auto parts supplier.

— Katz contributed from London. With files from Global News.