Credits: Press Service of the President of the Russian Federation / Wikimedia Commons — CC BY 4.0.
On September 4, 2025, in Paris, Emmanuel Macron brought together a “coalition of the willing.” Indeed, he stated that 26 countries are ready to contribute to a reassurance force for Ukraine. This force will be activated after a ceasefire in Ukraine and will operate away from the front line. What is this announcement for, who decides, where and when would it apply, and how would it be overseen? A breakdown of the stakes, the American backing, and the gray areas.
What Was Decided in Paris on September 4, 2025
At the end of a meeting of the “coalition of the willing” at the Élysée Palace, Emmanuel Macron says 26 countries are ready. Indeed, these countries will contribute to a “reassurance force” for Ukraine. This force will be present on land, at sea, or in the air, and activated after a ceasefire in Ukraine. In addition, it will operate away from the front line. The political objective is clear: raise the cost of any new aggression and secure the postwar period. The operational details remain deliberately vague, with the Élysée mentioning “robust” guarantees. In addition, a security guarantees framework for Ukraine is being finalized with Washington.
In this context, Volodymyr Zelensky welcomes a “concrete” step forward. Partners also mention possible tougher sanctions if Moscow refuses negotiations. Steve Witkoff, envoy of U.S. President Donald Trump, is present in Paris; a videoconference meeting with the White House follows the gathering, a sign of an openly transatlantic backing.
A Stated Strategic Ambiguity
Neither deployment areas nor rules of engagement are publicly detailed. This strategic ambiguity is meant to reassure Kyiv and deter Moscow. It avoids giving the Russian propaganda ammunition while preventing capitals from making hasty promises. It is effective in the short term for showing European leadership but shifts the burden of proof: tomorrow, the announcement will have to be turned into concrete arrangements — status-of-forces agreements, command chains, Ukraine air defense, logistical support, rotations, and funding.
This approach carries a deferred political cost. The more general the statement remains, the more parliaments will demand guarantees when it comes time to deploy European troops in Ukraine. The equation is well known: military coherence, legal legitimacy, and public support must move forward together.
European Autonomy Under The American Umbrella
The Parisian stagecraft sketches out a Europe taking the lead while locking in a U.S. safety net. The United States are expected to provide intelligence, air defense, and financial sanctions. Politically, it is a bet on relative autonomy: Europe decides, America endorses, Ukraine arbitrates.
The presence of Steve Witkoff and the call with Donald Trump anchor this co-production. Without American backing, the credibility of deterrence for Ukraine—especially in aerospace and cyber—would remain incomplete. But the more visible the transatlantic bond, the more the promise of “strategic autonomy” will have to prove itself. It must show that it is more than just a slogan.
“It Is Not For Russia To Decide”: A Normative Marker
NATO Secretary General Mark Rutte sets the guiding line. He states that “it is not for Russia to decide”. This concerns the sending of Western troops if Kyiv requests it and within the framework of a ceasefire. The message is normative as much as military: no veto for Moscow over a post-conflict securing arrangement. The public argument stresses this: the goal is to prepare peace through credible deterrence for Ukraine, not to escalate the war.
This doctrine will nevertheless have to withstand two tests. On the one hand, perception tests orchestrated by Moscow will pose a challenge. On the other hand, public fatigue in Europe could set in. That will happen if the “interregnum” between ceasefire and peace agreement drags on.
The Fault Lines: Berlin, Rome, and The Parliamentary Machine
Behind the show of unity, the granularity of commitments differs. Some governments say they are ready to deploy, while others favor training, cyber defense, demining, financial support, or maintenance. Berlin is increasing support but is holding back on sending troops, referring to conditions: U.S. participation, ongoing negotiations, Bundestag approval. Rome and other capitals are navigating between European solidarity and domestic constraints.
This parliamentary machinery will be decisive when it comes time to shift into gear. The executives have bought time with the announcement; they will have to pay cash in the votes and in the budgets. If Washington slows down, the European domino could wobble.
Coalition of the Willing for Ukraine Security
The choice of an ad hoc security coalition for Ukraine, outside NATO and EU frameworks, has several advantages. Indeed, it makes it possible to avoid the unanimity required in those organizations. In addition, this approach helps speed up decision-making. But it weakens legal clarity. The basis rests on Ukraine’s invitation, which is sufficient under international law for military assistance. In addition, this invitation will be supplemented by bilateral agreements and status-of-forces agreements (SOFAs). Advantage: flexibility. Risk: heterogeneous legal regimes and complex command chains.
To remain credible, the coalition will have to industrialize its promise: joint planning, interoperability, integrated air protection, shared logistics, funding framework, and unit rotations. Without this, deterrence will dissolve into talking points.
A Political Narrative: Reframing The European Debate
At home and abroad, the Macron camp is trying to reorder the debate. Calling a military presence “reassurance” rather than “intervention” is meant to depolarize it. In France, the executive is issuing a challenge to the opposition: on the right, the goal is to denounce an adventure. However, this must be done without seeming to abandon European security. As for the radical left, it must criticize the coalition while accepting aid to an attacked country. On the European stage, Paris is arguing for “robust peace” that conditions negotiation, rather than the other way around.
This grammar is consistent with the idea of “armed peace”: deterrence, reassurance, sanctions. It assumes the ability to keep together the promise made to Kyiv and control the risk of escalation.
Calculated Risks
Risk of an empty promise: if the ceasefire is delayed, the force remains virtual, credibility erodes, and publics grow impatient.
Risk of takeoff: when it comes time to actually deploy European troops in Ukraine, parliaments and budgets may slow things down. The election period in several countries will weigh on the window for execution.
Narrative risk: Moscow will try to recast the arrangement as “foreign occupation,” testing Europe’s resilience over time. Conversely, saying nothing would have confirmed the image of Western fatigue. Paris is choosing the threshold effect: signal today what would happen the day after peace.
What Does the “Reassurance Force” for Ukraine Cover?
The term is not a fixed legal concept. It refers to a mix of defensive missions and stabilization in Ukraine:
- Multilayer air defense (sensors, interceptors, electronic warfare) to secure Ukraine’s post-ceasefire airspace.
- Maritime security in the Black Sea: minesweeping, escorts, trade corridors, ISR surveillance.
- Demining and counter-IED operations on civilian routes and critical sites.
- Protection of infrastructure (energy, water, health, rail), with CIED, cyber, and civil protection teams.
- Regeneration of Ukrainian forces: maintenance, MCO, advanced training, and munition supply.
- Limited deterrent presence, away from the front line, at sites identified by Kyiv, with strictly defensive rules of engagement.
These options require tight integration with the Ukrainian general staff, common deconfliction procedures, a joint threat-assessment cell, and a political-military dashboard to adjust the arrangement.
Benchmarks And Precedents: Models Not To Copy
Historical references abound, but none matches exactly. NATO missions in the Balkans (IFOR/SFOR, KFOR) relied on UN Security Council resolutions and a stabilized multilateral framework. EU civilian missions (for example EUBAM, EUMM) illustrate post-conflict support, but with different mandates and resources. The future Ukrainian setup would be unprecedented: a coalition of states invited by Kyiv, linked to politico-financial guarantees and an assertive American role.
Consequence: more agility, less clarity. The price of flexibility will be clear governance, accepted by Kyiv, and a public mandate that is understandable to publics.
What We Can Say Today
Politically, Emmanuel Macron is taking the initiative back by proposing an architecture of armed peace: deterrence, reassurance, sanctions, with an American backing. Success depends on two hinges: operational execution (mandate, command, rules of engagement) and transatlantic durability. At this stage, the “reassurance force” serves more as a negotiating tool than a deployment plan. Indeed, it raises the cost of renewed hostilities and opens a door to a secure peace.
Figures and Benchmarks
- 26 contributing countries announced in Paris, September 4, 2025.
- 35 delegations involved in the coalition of the willing (in person and by video).
- 60% of the weapons used by Ukraine would be produced in Ukraine, according to Emmanuel Macron. With allies’ help, it is a priority to scale up this effort.
- Additional sanctions under consideration if Moscow refuses peace talks.
Bottom Line: Armed Peace Under Conditions
A promise of secure peace is only as good as its ability to become procedures, resources, and mandates. The coalition of the willing has set the course; it now has to build the map. Without a clear command structure, reassurance will remain just a word. With robust governance and an openly backed transatlantic link, it can change the dynamic of the day after the war.