European leaders are finding a way to speak with one voice against President Donald Trump and they're increasingly willing to say “no” to his demands. Trump's insistence on U.S. control over Greenland has sparked strong opposition from European leaders. During a showdown in Davos, Switzerland, last week, the prime ministers of Britain and Norway issued sharp warnings against Trump's threats. That European unity marks a shift from appeasing Trump to defying him, and Denmark's prime minister emphasized the importance of standing together. Trump's transactional approach to diplomacy has created a disconnect with European leaders.