Russian pipeline operator Transneft has warned Kazakhstan’s oil companies that ship crude to Germany via Transneft’s Druzhba pipeline that the customers of the Kazakh firms have until June to pay for metering services or risk a halt to supplies, trading sources told Reuters on Thursday. In early 2023, as Russian crude flows via the Druzhba pipeline dropped off, crude oil from Kazakhstan started flowing via the Russian pipeline network to Poland for further delivery to Germany. In December 2022, Kazakhstan’s…