The London-listed company posted a 14.4% drop in revenue to $202.9 million, mainly as a result of a 24.8% diminished output in Ukraine.
Operating profit (before exceptional charges) also fell by 37% to $51.6 million.
Average output for the year decreased from 9045 barrels per day in 2011 to 8281 bpd as JKX managed production delays in Russia.
However, the company achieved operational success during the year, having started commercial gas sales and ramping up production from the Koshekhablskoye field in Russia.
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