UK-listed JKX Oil & Gas has been hit by a 13% fall in oil and gas production at its assets in Ukraine and Russia, saying this week that its output dipped to 9000 barrels of oil equivalent per day between January and April from 10,400 boepd in the same period of 2016.

JKX’s sole asset in Russia — the Koshekhablskoye field — saw the largest decline, after the planned workover of a key producing well was delayed by a workover rig fire, the company said.