The US commitment to the military alliance has long been in doubt given Donald Trump’s sharp criticism of European allies and his apparent eagerness to foster ties with Vladimir Putin.
'We are talking about serious plans on the American side with regard to Greenland. These plans have long-standing historical roots,' Putin told an Arctic forum in the northern city of Murmansk.
Mark Rutte, the Secretary General, told Donald Trump that 'now is not the time to go alone' and that 'Europe needs to know that Uncle Sam still has our back.'