NATO bolstering eastern Europe – what is the alliance deploying amid Russia tensions?

Alliance nations have made announcements regarding deployments in eastern Europe – but what's deploying?

NATO has announced it is sending additional ships and fighter jets to eastern Europe as tensions with Russia continue to mount.

The military alliance also said allies are putting forces on standby as Russia's military build-up along the border with Ukraine carries on.

NATO said the deployments are "reinforcing Allied deterrence and defence".

There was no mention of any new British deployments but UK troops remain deployed as part of NATO's multinational battlegroups in Estonia and Poland.

The alliance said in recent days, a number of its members had made announcements regarding current or upcoming deployments.

Denmark is sending a frigate to the Baltic Sea and deploying F-16 war planes to Lithuania.

Spain is sending ships to join NATO's standing maritime force and considering sending fighter jets to Bulgaria.

Watch: What does Russia want from NATO?

The Netherlands is sending two F-35 fighters to Bulgaria from April and is putting a ship and land-based units on standby for NATO's Response Force.

France also stands ready to send troops to Bulgaria, NATO said, while the US has signalled it is considering increasing its military presence along NATO's eastern flank.

NATO Secretary General Jens Stoltenberg said in a statement: "NATO will continue to take all necessary measures to protect and defend all allies, including by reinforcing the eastern part of the alliance.

"We will always respond to any deterioration of our security environment, including through strengthening our collective defence."

NATO's announcement comes after the UK Foreign Office said some British staff and dependants are being withdrawn from the embassy in Ukraine in response to the growing threat from Russia.

Moscow has massed an estimated 100,000 troops near Ukraine's border.