More than half the Arctic's coastline is Russian territory and in the last six years Moscow has built more than 475 military bases along its northern border.

Trump has been highly critical of other Nato member states in recent weeks over their levels of defence spending as he pressures Western countries to do more to pay for their own security.

Trump has been highly critical of other Nato member states in recent weeks over their levels of defence spending as he pressures Western countries to do more to pay for their own security. Ahead of ...