SINGAPORE, March 8 (Reuters) - Values for April-lifting ESPO crude weakened further on Thursday, as limited demand and weak refining margins weighed on the Russian grade. Russia's Surgutneftegas may have sold April ESPO at premium of around $4.00 a barrel to Dubai crude, down from a previous deal done at around $5.50 a barrel, a trader said, although this could not be confirmed. Asian oil product cracks have weakened as demand for heating fuel for winter ends and more refineries have entered into maintenance. * TENDERS - Russia's Rosneft is offering two cargoes of Sokol crude for May 6-15 and May 22-31 loading via a tender which closes on Friday. Rosneft had sold April Sokol at a premium of $7.80-$8.00 a barrel in its previous tender. * MARKET NEWS - Royal Dutch Shell RDSa.L has stopped buying Iranian crude to comply with Western sanctions against Tehran and deliveries of oil under outstanding contracts will end within weeks, CEO Peter Voser said on Wednesday. - China's imports of crude oil and copper in February are expected to have fallen from January's levels, as many oil refineries start regular maintenance and industrial consumers push back metal shipments amid swollen inventories and feeble demand. - China, the world's top energy consumer, is expected to announce in the first half of this year a plan to cap total energy consumption for 2015, including individual targets for provinces, media reported. CRUDE Price Prev Change APRIL Brent 125.08 122.63 2.45 APRIL Brent/Dubai EFS DUB-EFS-1M 3.63 3.65 -0.02 PRODUCT CRACKS Price Prev Change APRIL fuel oil crack -6.47 -5.42 -1.32 APRIL gasoil crack 14.73 15.53 -0.80 APRIL naphtha crack -7.19 -6.41 -0.78 COMPLEX REFINERY MARGINS Today 6.57 Last 5 days 6.24 Lat 365 days 7.87 (Reporting by Francis Kan; editing by Miral Fahmy)

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