Russia is the biggest threat to peace in Europe. The ARFAllied Reaction Force is in constant readiness to defend NATONorth Atlantic Treaty Organization.
Robust, multinational and responsive: In July 2024, the Allied Reaction Force (ARFAllied Reaction Force) was established as a high-readiness NATONorth Atlantic Treaty Organization force for deterrence, crisis management and common security. 40,000 military personnel are ready to go wherever their capabilities are needed.
At this time, the main ARF troop contributors are Italy, Spain, France, the UKUnited Kingdom and Turkey. The troop contributors rotate with their contributions once a year. Germany’s contributions to the ARF include its ongoing participation in NATO’s Standing Naval Forces. Germany provides frigates, mine countermeasures units and supply ships.
Ultimately, the ARFAllied Reaction Force ensures that highly prepared forces are readily available to SACEURSupreme Allied Commander Europe , providing rapid response options for any situation.
If NATO’s North Atlantic Council decides to deploy the ARF, the force will be under the command and control of NATO’s Supreme Allied Commander Europe (SACEURSupreme Allied Commander Europe ). As of July 2025, USUnited States General Alexus G. Grynkewich is SACEUR. With the ARF, SACEUR has a rapid response force to counter any threat. The ARF must be mission-ready within ten days of alerting.
This large force replaces the previous NATO Response Force with its Very High Readiness Joint Task Force (VJTFVery High Readiness Joint Task Force ) of around 20,000 military personnel. The ARFAllied Reaction Force can be reinforced with forces from the NATO Force Model (NFMNATO Force Model) as needed. This model calls for some 100,000 military personnel to be mobilised within ten days to defend NATO territory. Another 200,000 additional forces are to be mission-ready after a maximum of 30 days, and 500,000 more military personnel after no more than six months. Within the framework of the NFMNATO Force Model, Germany has agreed to provide around 35,000 military personnel, as well as 200 ships and aircraft, within the first 30 days to defend the Alliance.
A powerful response: In addition to the Allied Reaction Force, NATONorth Atlantic Treaty Organization’s member states will mobilise around 800,000 more military personnel within six months to defend NATONorth Atlantic Treaty Organization territory if the Alliance is challenged.
Bundeswehr/Astrid HöfflingThe Strategic Concept adopted at the 2022 NATONorth Atlantic Treaty Organization Summit in Madrid calls Russia the biggest threat to peace and stability in the Euro-Atlantic area. In addition, international terrorism in all its forms is a threat to security and peace in the world. In NATO, the ARFAllied Reaction Force plays a key role in countering these threats. ARF forces can handle all types of operations, from humanitarian assistance to disaster control, from noncombatant evacuations to offensive operations within and outside of European NATO territory.
The ARFAllied Reaction Force was established on 1 July 2024. Its staff will initially be based near Milan, Italy for three years. In September 2024, part of the ARF moved out for the first time, to conduct exercises in Kosovo. In early 2025, the ARF trained in Southeast Europe to prepare for mobilisation and deployment in the event of a state of defence. 10,000 military personnel from nine NATONorth Atlantic Treaty Organization countries participated in the exercise.
In early 2026, ARF units are coming to Germany for NATO’s Steadfast Dart exercise. They are practising deployment from their home countries through Germany as a hub in order to train for the processes necessary in a state of defence. The NATONorth Atlantic Treaty Organization exercise is linked to the Bundeswehr’s Quadriga exercise series, held just afterwards. The main focus there will be on transport and medical care for injured military personnel.
