The public clash between Donald Trump and Volodymyr Zelenskyy has left European allies shocked, jeopardizing a minerals deal and raising concerns about U.S. support for Ukraine. European leaders are considering increased military spending and forming a coalition to support Ukraine independently. The London summit participants aim to influence the war's outcome by providing military support and security guarantees. Trump's shift towards direct negotiations with Russia raises questions about a new geopolitical reality and potential domestic political risks.