By Kate Abnett BRUSSELS (Reuters) – The European Union could wean itself off Russian gas within years and start curbing its reliance within months, the European Commission’s climate policy chief said on Monday. Russia’s invasion of Ukraine has triggered energy security concerns and the European Commission on Tuesday will propose plans to diversify Europe’s fossil fuel supplies away from Russia and shift faster to renewable energy. EU climate policy chief Frans Timmermans said the plans would “substantially reduce our dependency on Russian gas already this year, and within years will make us in…