Russia said it was seriously concerned by the arrival of NATO forces in Greenland, a mineral-rich island in the Arctic that US President Donald Trump has threatened to seize.France, Sweden, Germany and Norway announced Wednesday that they would deploy military personnel to the island's capital Nuuk as part of a reconnaissance mission.The announcement came after a meeting between US, Danish and Greenlandic officials in Washington failed to deter Trump's ambition of taking the island.Trump argues Greenland is vital for US security and that if Washington does not take it