BERLIN (Reuters) – German Economy Minister Robert Habeck on Sunday expressed fears that the European Union’s unity was “starting to crumble” ahead of a summit to discuss an oil embargo against Russia and plans to cut dependence on Russian energy. EU leaders will meet on Monday and Tuesday to discuss a new sanctions package against Russia, which could also include an oil embargo, and a programme aiming to speed up ending dependence on fossil fuels, including Russian gas. “After Russia’s attack on Ukraine, we saw what can happen when Europe stands united. With a view to the summit tomorrow, let’…