European leaders call for stronger defence ties after Trump’s Nato remarks

Polish PM Donald Tusk says all for one, and one for all' in thinly veiled riposte to Republican frontrunner

European leaders have called for greater unity and military cooperation across the continent in response to comments from Donald Trump that threatened to undermine the basis of Nato.

Donald Tusk, Poland's prime minister, said on a visit to Paris on Monday that there was no alternative" to the EU and the transatlantic alliance before a summit in which he discussed deepening defence relationships with the French president, Emmanuel Macron.