(Reuters) -Russian Deputy Prime Minister Alexander Novak said on Thursday that Russian oil production may decline by 4% to 5% in April from March due to problems with insurance and usage of vessels, news agencies reported. Reports of lower production come as Russian exporters experience difficulties in the face of Western sanctions over Moscow’s military operation in Ukraine. Russian oil production is already down by around 4% in early April, continuing to slide following a fall in March. Russia’s production of oil and gas condensate fell to 10.52 million barrels per day (bpd) on April 1-6 fro…