I was very disappointed with NATO," he said, singling out Britain, France, Germany and Italy for not doing enough to support the US war with Iran.Mr Trump said the US "weren't treated well" by the allies, even as he reiterated that he did not want or need their help.Tensions between Mr Trump and NATO leaders also flared up at the summit, in part due to the US president's volatile relationship with some, including a recent feud with Italian Prime Minister Giorgia Meloni, and his repeated intention to take Greenland from fellow NATO member Denmark.The president said his relationship with Ms Meloni "became a little bad because she refused to help us" with Iran."She refused to get involved, so it soured my relationship with her a little bit But I think she made a mistake," Mr Trump told reporters.Meanwhile, Mr Trump used his press conference with the Turkish president to reiterate Greenland "should be controlled by the United States, not by Denmark".Danish Prime Minister Mette Frederiksen said she expected allies to respect the sovereignty of the Danish kingdom and accept that Greenland was not for sale.NATO secretary-general Mark Rutte said before the summit got underway that Europeans had made "staggering" increases in defence spending.Mr Rutte called for a defence industry "revolution" across the alliance, warning over Russia's massive military spending as well as China, North Korea and Iran."We don't have the luxury of time