MOSCOW--Russia's gas giant OAO Gazprom said Wednesday its 2014 net profit plunged 980.26 billion ruble ($19 billion) on year to 159 billion ruble due to weakness in the Russian currency and instability in Ukraine.

Gazprom, facing tougher conditions in its biggest market Europe, saw its sales to the continent fall to 159.4 billion cubic meters from 174.0 bcm a year ago.

Russia's ruble plummeted last year, losing around half of its value against the dollar, due to lower oil prices and a crisis of confidence in the currency following Western sanctions on Russia over the crisis in Ukraine. The weaker ruble also pushed Gazprom's net debt higher by 48% to 1.65 trillion rubles.

The company said it suffered a 34 billion ruble loss on its balance sheet due to a dispute with Ukraine's state energy company Naftogaz. Gazprom has been in arguing with Naftogaz over energy prices to the former Soviet republic following the ouster of pro-Russian president Viktor Yanukovych.

Gazprom shares first fell after the earnings report then swiftly jumped higher. At 0741 GMT, Gazprom shares were up by 0.8% to 154 rubles.

Write to Andrey Ostroukh at andrey.ostroukh@wsj.com or Thomas Grove at Thomas Grove@wsj.com

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