By Valentina Za and Giancarlo Navach MILAN (Reuters) -Shares in UniCredit fell on Monday hit by a report of tensions between European Central Bank supervisors and the Italian bank over its capital distribution plans and presence in Russia. Analysts said the report may signal a more restrictive approach to shareholder remuneration by the ECB, in a negative development for the entire sector. “If confirmed, we would see the news very negatively for UniCredit and for EU banks, as they would convey a tightening of the ECB’s approach … just as profitability is growing,” analysts at Mediobanca Secu…