* Rosneft CEO says company working to offset sanctions effect
* Rosneft expects no changes in cooperation with foreign partners
* Statoil says no change in business with Rosneft
* Net income rises to 172 bln roubles thanks to rouble rise
* Rosneft says BP pays $1.9 bln in prepayment for oil supply (Updates after conference call)
By Vladimir Soldatkin
MOSCOW, July 25 (Reuters) - Russia's biggest oil producer Rosneft said on Friday it has been seeking ways to cope with the negative impact of international sanctions, as it reported higher net income Helped by a stronger rouble.
Kremlin-controlled Rosneft, which accounts for 40 percent of Russian oil production, was hit by U.S. sanctions over Moscow's actions in Ukraine, limiting the company's access to Western money.
Cooperation with international peers is important to Rosneft, 19.75 percent of whose shares are owned by BP. ExxonMobil also has a number of joint projects with Rosneft.
Chief Executive Officer Igor Sechin, a longstanding ally of Russian President Vladimir Putin, said the company has been working on a plan to offset the negative effect of the punitive measures.
"Together with our partners - the world's leading oil companies - we are working on a plan to minimise the consequences of including Rosneft on the sanction lists," Sechin said in the statement.
Svyatoslav Slavinsky, in charge of Rosneft's financials, told a conference call that the company does not expect any changes to its joint projects with international majors.
"Speaking about our forward plans regarding our cooperation with our partners, there have been no changes, everything has been done and (funding) is on track... We should not expect any major changes," he said through an interpreter.
The head of Norway's Statoil, with which Rosneft has plans to jointly develop Russia's Arctic offshore riches and hard-to-recover oil, said it has been studying the sanctions that have been implemented, but there has been no change in their cooperation.
However, Russian companies, including Rosneft, are facing tougher sanctions from the European Union as the deepest East-West spat since the end of the Cold War two decades ago flares.
The new round of punitive measures, following the downing of a Malaysian plane with 298 people on board over Ukraine in a pro-Moscow rebel-held province, may include a ban on exporting oil and gas producing equipment to Russia.
Rosneft said its net income in the second quarter - before the sanctions were introduced - surged by almost five times year-on-year to 172 billion roubles ($4.9 billion), beating analyst forecasts, due to a stronger rouble.
Rosneft reports in roubles and the stronger currency has a positive impact on its huge foreign currency-denominated debt.
Analysts, polled by Reuters, had expected April-June net income at 161 billion roubles. Excluding the foreign exchange effect, net income increased 88 percent year-on-year.
Rosneft's shares were down 0.7 percent in late afternoon trade, outperforming a 1.4 percent decline of the broader Moscow market.
The company said its earnings before interest, taxation, depreciation and amortisation (EBITDA) rose to 304 billion roubles, almost in line with expectations.
Sales for the period rose to 1.44 trillion roubles, slightly above the 1.42 trillion roubles expected by analysts. Rosneft reported it received $1.9 billion of advanced payments from BP in July under a five-year oil supply deal.
Free cash flow surged to 112 billion roubles while net debt declined to 1.495 trillion roubles.