Friedrich Merz calling out Trump’s foreign policy is an effort to get the US president to think less about Vladimir Putin and protect America’s allies, explains world affairs editor Sam Kiley The US president and the German chancellor have locked horns . Spain has shunned Washington. The Nato alliance is more fragile than it has ever been. Western powers are determined to see off Russian military “hard” power; they are familiar with “soft power” operations to undermine democracies. But how to