By Sumeet Chatterjee and Lawrence White HONG KONG/LONDON (Reuters) – HSBC is shunning prospective Russian clients and declining credit to some existing ones, two sources with knowledge of the matter told Reuters, as the bank seeks to shield itself from Western sanctions against Moscow. The measures affect HSBC’s individual and business customers globally and go further than the bank’s previously stated intentions to wind down its relations with lenders such as VTB, which were placed under Western restrictions after Russia invaded Ukraine on Feb. 24. The moves by Europe’s second biggest bank sh…