A bipartisan group of members of the US Congress is visiting Denmark in what is seen as a show of support in the face of increasing pressure from President Donald Trump for the US to annex Greenland - a semi-autonomous region of Denmark in the Arctic.

The 11-member delegation is due to meet MPs as well as Danish Prime Minister Mette Frederiksen and her Greenlandic counterpart Jens-Frederik Nielsen.

The visit comes days after high-level talks in Washington failed to dissuade Trump from his plans.

He insists Greenland is vital for US security - and that Denmark cannot defend it against possible Russian or Chinese attacks. Both Denmark and Greenland say they are opposed to a US takeover.

Greenland is sparsely-populated but resource-rich and its location between North America and the Arctic makes it well placed for early warning systems in the event of missile attacks and for monitoring vessels in the region.