(CNN) Several Russians who had been hired as paramilitary contractors were among more than 100 men killed in US airstrikes in northern Syria last week, according to their friends and families.

The men were working for a private Russian company called Wagner, which has sent hundreds of private contractors to Syria to help both the Russian military and pro-regime forces, according to people who knew them.

One of the dead was 51-year-old Vladimir Loginov. Like many contractors who have gone to Syria, he was a member of a Cossack group of ultranationalists who have also fought in eastern Ukraine.

The Baltic Cossack District said in a statement that Loginov was a Russian citizen who was killed in an "unequal battle" while "heroically defending our Fatherland in its far reaches from crazy barbarians" when he died on February 7.

"Vladimir died for the Fatherland, the Cossacks and the Orthodox faith!" the group said.

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