Russian oil firms face delays of up to several months to be paid for crude and fuel as banks in China, Turkey and the United Arab Emirates (UAE) become more wary of US secondary sanctions, eight sources familiar with the matter said. Payment delays reduce revenue to the Kremlin and make them erratic, allowing Washington to achieve its dual policy sanction goals – to disrupt money going to the Kremlin to punish it for the war in Ukraine while not interrupting global energy flows. Several banks in China, the UAE and Turkey have boosted their sanctions compliance requirements in recent weeks, res…