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Bridget Chapman, of KRAN, said the Home Office was hiding "behind a wall of secrecy" by not revealing the number of children involved.

"We have no idea if the accommodation where the children will be held is suitable, how their safeguarding will be ensured, if they will be allocated a social worker, or be able to access legal advice or education," said Bridget Chapman, of KRAN.

Andriy Kran, who said he served in the same battalion as Mr. Slipak, said the singer had become a kind of recruitment ad for Ukraine.

Hikmat Kran, 31, a photographer from the war-ravaged Syrian city of Aleppo, is among the 1,450 refugees in the closed camp at Harmanli.

“Here we at least have peace,” Mr. Kran said.