Donald Trump has linked his repeated threats to seize control of Greenland to his failure to win the Nobel peace prize, as transatlantic tensions over the Arctic island escalated further and threatened to rekindle a trade war with the EU. In an extraordinary text message sent on Sunday to the Norwegian prime minister, Jonas Gahr Støre, the US president wrote that after being snubbed for the prize, he no longer felt the need to think “purely of peace”.