Canada’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 politicizing 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.”

Ottawa initially declined to discuss the issue, citing privacy concerns, but on Tuesday, a spokeswoman for Citizenship and Immigration Canada confirmed some applications were denied, while others were still being reviewed.

“Each will be assessed on its merits by professional, non-partisan public servants in accordance with Canada’s security and immigration laws,” Nancy Caron said.

An official with Roscosmos, the Russian space agency, said only two of its 10-member delegation received Canadian visas for the 65th International Astronautical Congress,— 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.

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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 weeklong conference in Toronto, considered the world’s biggest space gathering. The theme of this year’s event is “Our World Needs Space.”

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 also denied visas to some 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.

Canada has previously taken a hard line against Russia when it comes to space. In April, the government called off the launch of a Canadian communications satellite on a Russian rocket citing “current events in the Ukraine.” Ottawa has yet to say when it might approve the launch, a spokesman for the satellite company said Tuesday.

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