Inside Russia's Trefoil military base in the Arctic

Russia now has a military base at the top of the world – on the remote archipelago of Franz Josef Land.

As global warming increases access to the Arctic region and its rich resources, Russia is expanding its military presence there – making some in the West nervous.

BBC Moscow correspondent Sarah Rainsford was given rare access to the Russian base, known as Arctic Trefoil.

Camera: Anton Chicherov

Producer: Liza Shuvalova