Keir Starmer joined European allies warning of a 'dangerous downward spiral' in Nato today after Donald Trump threatened a trade war over Greenland. A joint statement from Denmark, Finland, France, Germany, the Netherlands, Norway, Sweden and the UK said they stood 'firmly behind' the 'principles of sovereignty and territorial integrity'. The president has shocked the military alliance by warning that opponents of an American takeover of the Danish territory will be hit with punitive tariffs from February 1. In a bombshell post on his social media site, Mr Trump said levies will start at 10 per cent - and potentially...