berlin germany act bridge-builder u.s. president-elect donald trump help clear unanswered question view conflict iraq syria u.s. tie europe defence minister ursula von leyen say wednesday von leyen ask whether fear unite state trump could weaken support europe germany face heighten threat russia tell reuters expect washington stick longstanding commitment trans-atlantic tie expectation american commitment friendship continue unabated say wish find common basis understand problems big enough must tackle together germany expect u.s. stand long-standing commitment europe defense minister