By Yoruk Bahceli and Samuel Indyk LONDON, Dec 18 (Reuters) - For European markets overshadowed by the United States since the summer, investors are hoping a spending bonanza in Germany - the European Union's biggest economy - moves the dial in 2026. But first, they need to see evidence it will deliver. A Ukraine peace deal could boost sentiment too. European ​stocks have barely recovered the cash that has left since Russia's 2022 invasion of its neighbour. European shares outperformed U.S. stocks in th ...