A rift appears to be developing between Europe and its long-time ally, the United States. US Vice President JD Vance stunned delegates at a security conference in Munich when he lectured Europe on what he described as its retreat from free speech and shared values. His comments have been widely denounced as meddlesome and unacceptable. So, where does this leave transatlantic relations -- built up over decades after World War Two? And how can Europe respond to a reversal of Washington’s isolationist stance towards Russia?