Prime Minister Mark Carney on Tuesday said Canada would boost its military and security presence in the Arctic, a frozen and mineral-rich expanse that is of increasing interest to U.S. President Donald Trump.

Prime Minister Mark Carney announced Tuesday a Can$6 billion (US$4.2 billion) deal with Australia to develop an Arctic radar system, warning that Canada must take more responsibility for its defence as US priorities shift.

Prime Minister Mark Carney said Tuesday that Ottawa will expand the Canadian Armed Forces’ presence in the Arctic and turn to Australia's over-the-horizon radar tech to monitor threats from adversaries such as China and Russia.