By Sruthi Shankar and Susan Mathew (Reuters) -Europe’s main stocks index roared back on Friday, lifting off nine-month lows with banks leading a broad-based rally as investors hunted for bargains following a bruising sell-off after Russia’s invasion of Ukraine. Hopes for diplomacy aided sentiment after the Kremlin said Russian President Vladimir Putin is ready to send a delegation to Minsk for negotiations with representatives of Ukraine. This come after missiles pounded Kyiv as Russian forces pressed their advance. The STOXX 600 ended the day up 3.3%, after dropping to May lows on Thursday. A…