The Kremlin has forced thousands of migrants and foreign students to fight alongside Russian troops in its war against Ukraine, adding extra manpower for its offensive in the Kharkiv region, according to assessments from European officials.

Using tactics first deployed by the Wagner mercenary group, Russian officials have with increasing frequency been threatening not to extend the visas of African students and young workers unless they agree to join the military, according to officials familiar with the matter.

Moscow has also been enlisting convicts from its prisons while some Africans in Russia on work visas have been detained and forced to decide between deportation or fighting, one European official said. Some of those people had been able to bribe officials to stay in the country and still avoid military service, said the official, who like other people cited spoke on condition of anonymity.