Oil prices have jumped to the highest level for nearly four years after Saudi Arabia and Russia ruled out any immediate increase in production.
The decision on Sunday was effectively a rebuff to US President Donald Trump, who called for immediate action to raise global supply.
Union Jack Oil plc (LON:UJO) is an onshore oil and gas exploration company with a focus on drilling, development and investment opportunities in the United Kingdom hydrocarbon sector listed on the London Stock Exchange AIM market.