The EU uses the term "shadow fleet" to refer to tankers flying the flags of foreign states that, in Brussels’ assessment, transport Russian oil LONDON, March 26. /TASS/. UK Prime Minister Keir Starmer granted British military personnel authorization to detain vessels of the so-called shadow fleet in the waters of the kingdom, the prime minister’s office reported in a statement. TASS has compiled the key information on the situation. The United Kingdom’s decision - UK Prime Minister Keir Starmer