Turkey halts oil tankers as Russia price cap takes effect in latest sanctions squeeze over Ukraine invasion

Minerva Baltica crude oil tanker passing under a bridge over the Bosphorus. Photograph: Yoruk Isik/Reuters

Julian Lee and Alex Longley

Oil tankers hauling millions of barrels of Kazakh crude are being prevented from leaving the Black Sea to reach global markets following a move by Turkey to insist on proof they're properly insured.