Former Latvian PM urges European coalition to guarantee Ukraine ceasefire line

Europe's security architecture is being tested in ways not seen since the Cold War, and the continent's leaders are running out of time to decide what they are willing to enforce. Krišjānis Kariņš, who served as Latvia's prime minister from 2019 to 2023, has laid out a stark proposition: if the United States under Donald Trump refuses to back Ukraine's NATO membership, a coalition of willing European allies must step forward to physically secure whatever demarcation line emerges from a negotiated ceasefire. Without that commitment, he argues, any pause in fighting will simply replicate the 2014 experience, a frozen conflict that Moscow used to rearm before launching the full-scale invasion of February 2022.

The strategic backdrop: a war entering its fourth year

Russia's full-scale invasion has now lasted more than 1,000 days. Despite catastrophic losses in personnel and equipment, the Kremlin has sustained its war effort through a defence economy geared for attrition and external support from Iran, North Korea and China. Ukraine, by contrast, has depended on a Western supply chain characterised by what Kariņš describes as "constant caution and delay, often resulting in 'too little, too late'." The Biden administration's incremental approach, hesitating on tanks, long-range missiles, and aircraft, has left Kyiv perpetually one step behind the battlefield's evolving demands.

The incoming Trump administration introduces a new variable. Campaign rhetoric and early personnel choices suggest Washington may seek a rapid settlement, potentially pressuring Kyiv to accept territorial concessions in exchange for a ceasefire. Kariņš warns that both Ukraine and Europe must have a seat at any negotiating table. "When it does, both Ukraine and Europe must have a seat at the negotiating table," he writes, referring to the moment Trump attempts to force an end to hostilities. The alternative is a deal imposed from outside that leaves Ukraine vulnerable and Europe's eastern flank exposed.

Why a ceasefire alone will not hold

The precedent is unambiguous. After Russia's illegal annexation of Crimea and the outbreak of war in Donbas in 2014, the Minsk agreements produced a ceasefire that held in name only. Moscow used the breathing space to rebuild its military, modernise its command structures, and prepare for the 2022 invasion. Kariņš is blunt: "Recent experience clearly shows that simply coming to a cease-fire agreement with Russian President Vladimir Putin won't bring peace." The lesson, he argues, is that a line on a map means nothing without the credible threat of force behind it.

This is not a theoretical concern. Russian doctrine treats frozen conflicts as tools of leverage, Transnistria, Abkhazia, South Ossetia, Donbas. Each serves as a permanent destabilising factor in a neighbour's politics. A ceasefire in Ukraine that leaves the front line unguarded by forces capable of punishing violations would hand the Kremlin the same instrument: a wound that can be reopened at will.

NATO membership: the preferred option, now likely blocked

Ukraine's new Foreign Minister, Andrii Sybiha, has made the case for full NATO membership as "the only serious security guarantee" for his country. The logic is sound: Article 5 extends the alliance's nuclear umbrella and integrated command structure to the new member, raising the cost of aggression to a level no rational Russian leadership would accept. But Kariņš notes the political reality. The same argument that blocked Ukraine's Membership Action Plan at the 2008 Bucharest summit, fear of provoking a nuclear response, is being recycled today. With Trump sceptical of alliance commitments and European capitals such as Berlin and Paris historically cautious, the consensus required for accession does not exist.

"The belief that Putin would start a nuclear war in order to fulfill his dream of creating a new Russian empire, and that peace can be maintained through appeasement," Kariņš writes, "but the past 1,000 days are proof this isn't true." The deterrence argument cuts both ways: if NATO membership is ruled out because it might provoke escalation, then the alliance has already conceded that its red lines can be manipulated by nuclear threats.

A coalition of the willing as Plan B

If NATO membership is off the table, Kariņš proposes a functional alternative: a coalition of willing NATO allies, led by Europe, that deploys forces to monitor and enforce a future demarcation zone. This would not be a NATO mission under Article 5, but a voluntary grouping of nations prepared to put their militaries on the line. The United States, he suggests, might support the effort politically and logistically even if it declines to contribute "boots on the ground."

The model has precedents. The Kosovo Force (KFOR) has operated since 1999 under a UN mandate but with NATO as the backbone. The Multinational Force and Observers in Sinai has maintained the Egyptian-Israeli peace since 1982. Neither required full alliance consensus; both relied on a core of committed nations. A Ukraine mission would be larger, more dangerous, and politically fraught, but the principle is established.

Crucially, such a coalition would need a mandate. The UN Security Council is paralysed by Russian and Chinese vetoes. The OSCE lacks enforcement capacity. That leaves a political agreement among the coalition partners themselves, backed by bilateral security guarantees with Kyiv. The legal basis would be novel, but international law permits collective self-defence at the request of a sovereign state under Article 51 of the UN Charter.

Europe's defence industrial base and the new commissioner

The European Commission has appointed its first ever Commissioner for Defence and Space, a portfolio created in the current mandate to address the fragmentation of European defence procurement and industrial policy. The move is overdue. Europe's defence industry remains split along national lines, duplicating effort and failing to achieve the economies of scale that the US defence sector takes for granted. The new commissioner is expected to push for joint procurement, interoperability standards, and a consolidated industrial base.

But Kariņš warns that industrial policy is a long-term project. "With war on its doorstep, the EU needs more than just a defence industry that's fit for purpose. It needs hard military power to ensure Ukraine will continue as an independent country if a cease-fire can be attained." Battlegroups, air defence batteries, engineering corps, and intelligence assets cannot be conjured from a white paper. They require political decisions to deploy, rules of engagement agreed in advance, and the willingness to accept casualties.

The leadership vacuum and Europe's moment

The core of Kariņš's argument is about leadership. The Biden administration led the Ramstein contact group and coordinated military aid, but always with one eye on escalation management. The Trump administration may abandon that role entirely. The UN is structurally incapable. That leaves Europe, specifically, the European members of NATO, as the only actors with both the proximity and the interest to guarantee a settlement.

This is not a role Europe has sought. For three decades, the continent has outsourced hard security to Washington while building a regulatory superstate. The war in Ukraine has shattered that comfort. Poland, the Baltic states, the Nordics, and increasingly France and Germany understand that a Russian victory, or a frozen conflict that leaves Ukraine defenceless, would place the next confrontation on NATO's eastern border, not Ukraine's.

What a European-led mission would require

Translating Kariņš's concept into reality would demand decisions that European capitals have so far avoided. First, a political consensus among the willing, likely Poland, the Baltic states, the Nordics, the UK, France, and possibly Germany, on the mission's mandate, rules of engagement, and command structure. Second, a formal request from Kyiv, which would frame the deployment as collective self-defence under Article 51. Third, a sustainment plan: rotations, logistics, medical evacuation, and the air defence umbrella to protect the force from Russian stand-off weapons.

The force would need to be large enough to be credible. A token observer mission would be targeted and withdrawn. A robust formation, perhaps a reinforced corps with integrated air defence, long-range fires, and ISR assets, would signal that violations carry immediate military consequences. That in turn requires national parliaments to approve deployments, a test of political will that has no guaranteed outcome.