The potential for a new energy crisis in the European Union is examined following Ukraine’s decision to halt the transit of Russian natural gas. With the coldest winter expected, experts analyze fuel availability, price impacts, and whether the EU’s mechanisms for market regulation can handle the situation. Donald Trump’s warnings about increased tariffs if Europe does not purchase more American hydrocarbons are also discussed. Legal expert Marika Karagianni provides insights on international energy issues and energy diplomacy.