By Davide Barbuscia, Catherine Belton and Ira Iosebashvili NEW YORK/LONDON (Reuters) -Investors were preparing on Saturday for more wild gyrations in asset prices after Western nations announced a harsh set of sanctions to punish Russia for its invasion of Ukraine, including blocking some banks from the SWIFT international payments system. New measures announced by the United States, Britain, Europe and Canada also include restrictions on the Russian central bank’s international reserves. The moves will be implemented in the coming days. Investors have feared Russia would get kicked off SWIFT,…