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The International Space Station is shown orbiting the Earth. Canada is playing host to the prestigious 65th International Astronautical Congress.NASA/Reuters

The Canadian government's refusal to allow Russian delegates to attend a prestigious international astronautical symposium has angered Moscow, which said the decision flies in the face of international space co-operation and amounts to a politicizing of space exploration over the conflict in Ukraine.

A spokesman for the Russian embassy on Tuesday called Ottawa's decision to deny visas for the delegates – including one of the country's most renowned astronauts – unfortunate.

"In this regard, we can only express regret that a number of members of the Russian delegation did not get their visas," Kirill Kalinin, second secretary at the Russian embassy in Ottawa, told The Canadian Press. "This act unfortunately does not bring benefit to the Russian-Canadian bilateral relations."

The Canadian government has refused to discuss the issue, citing privacy reasons.

However, an official with Roscosmos, the Russian space agency, said only two of its 10-strong delegation received Canadian visas for the 65th International Astronautical Congress in Toronto – both of them translators who were the last to apply.

"Failure to obtain visas for Russians is clearly politically motivated," the official told the Interfax news agency.

On Monday, The Canadian Press reported how the absence of the Russians had blindsided the president of the Canadian Space Agency, Walter Natynczyk.

The retired general said he had only just learned about the visa issue.

"I guess I'm equally surprised," Natynczyk said. "Before I come to any conclusions, I would like to know exactly how it transpired."

On Tuesday, the Moscow Times said famed cosmonaut Sergei Krikalev – who spent 10 months aboard the orbiting Mir space station in 1992 – was among the Russians denied visas to attend the world's biggest space gathering.

However, Krikalev was reported as telling the TASS news agency that he simply applied for a visa too late, a point disputed by Roscosmos.

"All the visa applications were filed on time," Irina Zubareva, Roscosmos press secretary, told The Moscow Times.

It remains unclear what Russia can do to protest the situation, given the exclusive right countries have to deny visas.

Canada apparently also denied visas to Chinese delegates.

Berndt Feuerbacher, past president of the International Astronautical Federation, said he regretted the absence of the Russian and Chinese space-agency heads.

"They were foreseen to be here with us, they have been with us in the past, and they will be with us in the future," Feuerbacher said. "It is just unfortunate, due to problems especially in the visa area, that we couldn't have these delegations here. I apologize for this."

The Canadian Aeronautics and Space Institute is playing host to the showcase congress. About 3,000 delegates from space agencies, companies, academia and government from about 70 countries around the world, including France, South Africa and Mexico, have descended on the downtown convention centre.

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