The European Union (EU) has been the global leader in sustainable development strategy and climate change mitigation for decades. Key strategic documents, which indicate dedicated environmentally friendly policies of the Union, include, e.g., Europe 2020 Strategy, the Strategy for Circular Economy, the European Green Deal (EGD), and Fit for 55 package. In terms of Europe 2020 strategy on smart, sustainable and inclusive growth, the EU reached over 20% reduction of greenhouse gas (GHG) emission (from 2010 to 2020). And in terms of EGD, the most ambitious goal was set to make Europe the first climate-neutral continent with zero net GHG emission by 2050. Open Russian aggression against Ukraine in Feb 2022 forced Europe to be ready for new challenges, including overcoming dependence on Russian energy resources. Answering these challenges, the EU adopted REPowerEU strategy to eliminate its dependence on Russian fossil fuels till 2030. The Union imposes economic sanctions on the Russian regime and provides powerful financial support to Ukraine. Keeping in mind a huge military machine of Russia and terrorist way of thinking of its leader it seems we still need much more international efforts to turn Europe back to a sustainable track of development.