KYIV, March 16 – A major supplier of diesel fuel and LPG to Ukraine, the Swiss-based Proton Energy Group, will completely suspend deliveries starting on April 1, the company said Tuesday.

In a letter to its customers, Proton said it has been facing an increasing pressure from the authorities since early March that has significantly increased its logistics costs.

“We deeply regret to inform you that Proton Energy Group SA has decided to terminate cooperation and stop supplying oil products to the Ukrainian market,” the company said in the letter.