Reading Time: 6 minutesBy Stefan Wolff, Professor of International Security, University of BirminghamTwo statements from world leaders this week bear closer examination. There can now be no doubt left that the US has become an unreliable ally for Ukraine and its European partners. Germany is finally beginning to pull its weight in European defence and security policy. The war against Ukraine has exposed European vulnerabilities and its dependence on the US. The first test of this apparent new-found European mettle will be the war in Ukraine.