Faced with US demands to provide the military muscle to enforce a future Ukraine peace deal, Europe finds itself in a bind.
Experts say that sending European peacekeepers to Ukraine might stretch and weaken NATO’s own defenses, and that the mission would still need US support to succeed.
While US boots on the ground might not be necessary, deterrence in the form of US medium-range missiles and ultimately nuclear weapons would remain crucial.
“I’m not sure that any security guarantee will be 100 percent credible against an aggressive and nationalistic [Russian President Valdimir] Putin unless it involves the Americans in some way,” said Mark Lyall Grant, Britain’s national security adviser during part of Trump’s first term.
European officials also say that only a US guarantee would protect European peacekeepers and deter Russia from any future attack on Ukraine.
US President Donald Trump last week shocked Europeans by arranging bilateral peace talks with Russia, which were launched on Tuesday in Riyadh, while US Secretary of Defense Pete Hegseth told allies that “any security guarantee must be backed by capable European and non-European troops.”
He made it clear US troops would not be sent to Ukraine.
At an emergency meeting in Paris on Monday, European leaders remained split on the idea of deploying peacekeepers to Ukraine, a plan some European nations had started discussing last year at France’s initiative.
WEAKENED NATO
Such a force would raise the risk of a direct confrontation with Russia and stretch European militaries, whose arms stocks have been depleted by donations to Ukraine and which are used to relying heavily on US support for major missions.
British Prime Minister Keir Starmer on Monday said that he was willing to send troops to Ukraine, but there would need to be a US “backstop” as well.
Experts warn that deploying a large European force to Ukraine might weaken NATO’s defenses against a wider and growing threat from Russia as a halt to the conflict would enable its war economy to replenish military stockpiles rapidly.
Some also doubt whether European nations, which have been struggling to boost readiness after decades of relative peace since the Cold War ended, could quickly raise enough combat-ready troops, especially if they were asked to secure more than 2,000km of contact line with Russia and Moscow’s ally Belarus.
Claudia Major, an analyst for the German SWP think tank, said assembling such a peace force was barely achievable for the Europeans on their own.
Estimates of its required strength range from 40,000 to 150,000, in addition to Ukrainian forces, she told the German broadcaster ARD on Monday.
For comparison, NATO’s peacekeeping force in Kosovo started out with 48,000 troops in 1999, securing a territory of 11,000km2, according to a study coauthored by Major, whereas Ukraine is almost 55 times that size.
“The Europeans don’t have this mass at the moment unless they weaken their own defense or the planned defense of the Baltics, for example, which is obviously controversial,” Major said. “At the same time, they lack key capabilities in the areas of reconnaissance, air defense or targeting, which only the US has to a sufficient extent.”
DETERRENCE
Michael Kofman, a senior fellow at Carnegie Endowment, said a deployment of three brigades, units of about 3,000 to 5,000 troops, at any one time might be sufficient to secure the four to five sectors of the front where fighting was concentrated.
The usual rotations for recreation and training would triple the number required to perhaps 50,000 “without canceling all existing regional defense plan requirements,” he wrote on social media. “But the force needs to have battalions near the front, not milling about in Western Ukraine doing training,” he said, adding that such units would have to be mobile.
“The bigger question is, what should this force do, and how does it deter?” he said.
He also asked what military actions might be triggered by any Russian infringement of the ceasefire: “If it is a tripwire, what does it attach to?”
Some experts advocate leaving it to Ukrainian forces to secure the contact line while keeping a means of deterrence outside.
Hegseth did not explicitly state that peacekeeping troops must be stationed inside Ukraine, but made it clear they would not be covered by NATO’s mutual defense clause, Article 5.
However, Russian Minister of Foreign Affairs Sergei Lavrov told reporters in Riyadh on Tuesday that the presence of any troops from NATO nations inside Ukraine was unacceptable to Russia, whatever flag they flew, but providing a deterrent from outside Ukraine might pose a different dilemma for the Europeans, who lack the medium-range weapons that could strike Russian targets from a distance in retaliation for ceasefire violations.
Nor do they have the giant US nuclear arsenal that provides the ultimate deterrent against nuclear-armed Russia.
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