The prolonged stay of migrants’ families is straining the Russian social sphere, the former president has said Ethnic enclaves formed by extended families of migrant workers can be hotbeds for the spread of extremist ideologies, former Russian president and the deputy chair of the country’s Security Council, Dmitry Medvedev, believes. Medvedev made the remarks on Thursday during a meeting to address migration and potential improvements to the country’s legislation in this field. Extended