And Are They Already In British Police Custody?

Or are they to be arrested at the port-of-entry?

https://news.sky.com/story/ukraine-five-british-pows-detained-by-russian-backed-separatists-have-been-released-says-liz-truss-12702834

https://www.theguardian.com/uk-news/2022/jul/13/mi5-needs-more-funds-to-tackle-rightwing-terror-threat-says-watchdog

https://en.wikipedia.org/wiki/Azov_Regiment