Since their parents’ arrest on espionage charges, the two brothers, who were born in Canada, have been involved in a prolonged legal battle to have their Canadian citizenship reinstated. The latter was rescinded when it became clear that their parents’ Canadian passports were fraudulent. According to the Canadian Citizenship Act, children born in Canada to “employees of a foreign government” are not entitled to Canadian nationality. But the brothers have argued that they were 20 and 16 when their parents were arrested and were unaware of their double identities. It follows, their lawyers have argued, that they cannot be punished for their parents’ crimes.

In June of 2017, Canada’s Federal Court of Appeal overturned the decision of a lower court and ordered the government to reinstate Alexander Vavilov’s Canadian citizenship. But the Canadian government appealed the decision of the Federal Court of Appeal, which sent the case to the Supreme Court of Canada. The government claimed that the Vavilov brothers should be denied Canadian citizenship because their parents were, effectively, secret employees of a foreign government. The two Russian spies may not have been accredited by the Canadian state as foreign employees, it says, but they were in reality “dedicated to serving their home country, except in their case, the employment was carried out clandestinely”.

On Thursday, however, Canada’s Supreme Court sided with Alexander Vavilov’s lawyers and ordered that he can keep his Canadian citizenship. This decision, which has effectively upheld the earlier decision of the Federal Court of Appeal, almost certainly means that Alexander’s brother, Tim, will also have his Canadian citizenship reinstated.