LONDON, Dec 15 (Reuters) - After a stellar 2025, investors expect shares in European banks to keep heading higher in 2026, supported by strong earnings and, crucially, cost savings stemming from artificial intelligence. As fears of a recession and interest rate cuts from the European Central Bank have subsided, investors have turned ​even more positive towards European banks, revising up their expectations for the sector, despite a complicated backdrop. Meanwhile, AI has emerged as a new force drawing i ...