NATO: which countries make up the alliance?
NATO was formed by 12 nations in 1949 to deter the expansion of the Soviet Union and has more than doubled in size since.
Nato
-
Nato -
Nato Finland and Sweden one step closer to joining NATO
Despite accession protocols being signed off, it could take several more months for the countries to become official members.
-
Germany British troops train at Europe's largest urban training facility complete with own airport
Schnoeggersburg is Europe's largest urban training facility, with collapsing bridges, underground networks and even an airport.
-
Nato PM commits to raising UK defence spending to 2.5% of GDP by end of decade
Boris Johnson said the "cost of freedom" is "always worth paying".
-
Nato UK military experts deployed to Bosnia and Herzegovina to counter Russian influence
Boris Johnson said the Western Balkans cannot be allowed to "become another playground for Putin's pernicious pursuits".
-
Aircraft Two more US F-35 squadrons heading to UK as Biden boosts Europe presence
The president announced a number of US reinforcements to Europe at the NATO summit in Madrid.
-
Estonia British military presence in Estonia to be bolstered
Boris Johnson will use a NATO summit in Madrid to expand Britain's headquarters in Estonia.
-
Politics Boris Johnson faces defence spending row as NATO leaders gather
A senior source said the Government could be forced to abandon a commitment to increase the defence budget by 0.5% above inflation.
-
Army Army chief: This is our 1937 moment and we must act swiftly to stop war
Britain must be prepared to act rapidly to prevent the spread of war in Europe, the head of the Army has said.
-
Army Operation MOBILISE: Army's new primary focus
The programme is aimed at meeting threats and will require "ruthless prioritisation", the head of the British Army has said.
-
Nato NATO to boost forces to 300,000+ in clear message to Russia
Secretary General Jens Stoltenberg has set out a plan for the biggest overhaul of NATO since the Cold War.
-
Nato What military support has the UK given Ukraine?
Since Russia's annexation of Crimea in 2014, allies significantly stepped up their support.
-
Exercises Navy frigate hones skills on NATO's biggest sub-hunt exercise
HMS Portland and her crew joined surface ships and aircrafts on Exercise Dynamic Mongoose 22.
-
Aircraft RAF Typhoons team up with Turkish Air Force for training
The jets from 3 (Fighter) Squadron are currently based at Mihail Kogalniceanu air base in Romania as part of 140 Expeditionary Air Wing.
-
Sea vessels Navy's most advanced submarine completes NATO operation in Mediterranean
HMS Audacious trained alongside NATO allies on her maiden operational deployment.
-
Ukraine UK, US and Germany to send rocket systems to Ukraine
The three NATO countries said they are committed to supporting Ukrainian armed forces with rocket systems and munitions.