UK non-profit organisation Presidium Network said Paul Urey (pictured) and Dylan Healy were captured on Monday at a checkpoint south of the city of Zaporizhzhia in south-eastern Ukraine.
Mr Urey, 45, from Manchester, was described by Mr Byrne as a “family man with children. His mother, Linda, said the family “were extremely worried” about Mr Urey, who is diabetic and needs insulin.
Mr Healy, a chef from Huntington, Cambridgeshire was driving the car when the pair were captured by the Russian military at a checkpoint, the Presidium Network said.
The Foreign Office said it is urgently seeking more information.
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