Emiliano Sala was flying to Cardiff when plane carrying him and another person went missing.
The Russian Ministry of Defense said it was "amazed" by London's response.
Captain Webb celebrates the old-school bravery of the first man to swim the Channel.
The decision to prosecute 40-year-old Rahman Haroun has been criticized by migrants' rights groups.
The Sudanese man was arrested by British police close to the Folkestone terminal in Kent.
Vessels led by anti-submarine ship on way to northern Atlantic for defense drills, says Russian navy.