PARIS-- Total SA has stopped increasing its stake in Russia's second-largest gas producer OAO Novatek since the crash of Malaysia Airlines Flight 17 and is bracing for the possible impact of tougher international sanctions against the nation.

The oil major, which on Wednesday posted a 12% drop in its second-quarter adjusted net profit, will review the sanctions and discuss them with its partners in Russian projects at the end of August, said Chief Financial Officer Patrick de la Chevardière

The European Union's sanctions for the first time targets sectors of Russia's economy, including its state-controlled banks and its oil industry. The moves remain tightly focused because the EU wants to give President Vladimir Putin a chance to stop his alleged support of rebel groups in eastern Ukraine.

Like other energy giants, Russia is a crucial market for Total, which expects the biggest share of its oil and gas output to come from the country by 2020. BP PLC warned investors on Tuesday that the sanctions could weigh on its future earnings while its second-quarter profit were boosted by its stake in the Russia government-controlled oil group OAO Rosneft.

Total forecasts that its hydrocarbon production in Russia is set to increase to 400,000 barrels a day from 207,000 last year, thanks to its partnership with Novatek and their joint project of liquefied natural gas of Yamal, off the Arctic Circle, along with China National Petroleum Corp.

"Russia is a great oil and gas country and we'll have to wait and see the nature of these new sanctions first," Mr. de la Chevardére said in a conference call.

But the group, which has planned to eventually increase its stake in Novatek to 19.4% from an initial 12.08% bought in 2011, stopped buying shares in the Russian group since the Malaysia Airlines MH17 crash over Eastern Ukraine on July 17, Mr. de la Chevardére said.

"We stopped buying (Novatek) shares with the Malaysia Airlines accident, " he said without elaborating.

Total now owns 18% of Novatek, whose largest shareholders, Russian billionaire Gennady Timchenko, was targeted earlier by a wave of U.S. sanctions following the annexation of Crimea by Russia in March.

The French oil major's net profit adjusted for change in inventories dropped to $3.15 billion in the second quarter from $3.58 billion a year earlier. Net profit fell to $3.1 billion from $3.36 billion.

The results were due to a drop of oil and gas output to 2.054 million barrels of oil equivalent a day from 2.29 million a year earlier, on the back of the Libyan unrest and the loss of a license in the United Arab Emirates, which is to be re-attributed at a later date. This was also due to a high number of planned maintenance over the period.

Total also suffered from the continuing challenging environment of the refining business in Europe with margins down to $10.9 a ton from $24.1 a year earlier.

Total's CFO said he was confident for the rest of the year despite the geopolitical uncertainties as startups should boost production.

The group is current putting the final touches to a cost-cutting plan, which is to affect all lines of businesses and will be announced during an investor day on Sept. 22. No job cuts are planned at that stage, Mr. de la Chevardére said.

-Write to Géraldine Amiel at geraldine.amiel@wsj.com;

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