Divisions among the many world’s prime financial officers over how one can use Russia’s central financial institution property to assist Ukraine spilled into public view on Wednesday when Bruno LeMaire, France’s finance minister, mentioned that seizing the frozen property can be a violation of worldwide regulation.

The feedback, made on the sidelines of the gathering of finance ministers of the Group of 20 nations in Brazil, got here a day after Treasury Secretary Janet L. Yellen mentioned that seizing the property was a risk and recommended that there was a authorized justification for doing so.

Officers from the Group 7 superior economies have been debating for months over whether or not they may legally seize greater than $300 billion in Russian central financial institution property stashed in Western nations and use these funds to assist Ukraine. These discussions have taken on larger urgency amid waning political assist in america and Europe to proceed to offer Ukraine with financial and army assist.

Ms. Yellen, who initially had reservations concerning the viability of freezing or seizing Russia’s property, supplied her most express public assist to this point on Tuesday for the concept of unlocking “the worth” of Russia’s immobilized property.

“Whereas we should always act collectively and in a thought-about manner, I imagine there’s a sturdy worldwide regulation, financial, and ethical case for shifting ahead,” Ms. Yellen mentioned.

However Mr. LeMaire, who spoke only a few hours forward of a personal assembly with Ms. Yellen, pushed again on that assertion.

“We don’t have the authorized foundation to grab the Russian property and we should always by no means act if we don’t obey by the worldwide regulation and by the rule of regulation,” Mr. Le Maire mentioned, in line with a recording of his remarks.

Western officers have been contemplating a number of choices for a way they will use the roughly $300 billion Russian central financial institution property, most of which is held within the European Union, to offer financial and army assist for Ukraine. That features the European Fee’s proposal of utilizing curiosity earned on these property, utilizing funds as collateral to borrow cash for Ukraine or giving Ukraine the cash immediately.

There have been indicators of rising momentum amongst western policymakers to make use of Russia’s property as Ukraine’s army scenario turns into extra dire. Rishi Sunak, Britain’s prime minister, urged his counterparts this week to be extra aggressive of their efforts to discover a lawful strategy to seize Russia’s property. Nonetheless, France and Germany have been urging a extra cautious method and Russia has vowed to retaliate if its property are seized.

In a speech earlier than the European Parliament on Wednesday, the European Fee president, Ursula von der Leyen, expressed assist for utilizing earnings earned on these property to assist Ukraine’s army.

“It’s time to begin a dialog about utilizing the windfall earnings of frozen Russian property to collectively buy army tools for Ukraine,” she mentioned. “Finally that is about Europe taking accountability for its personal safety.”

Some authorized students have argued that nations that maintain Russian property are entitled to cancel their obligations to Russia and apply these property to what Russia owes for its breach of worldwide regulation beneath the so-called worldwide regulation of state countermeasures.

Ms. Yellen threw her assist behind the idea of countermeasures at her information convention on Tuesday.

“There’s a countermeasures idea that I imagine has sturdy justification in worldwide regulation,” mentioned Ms. Yellen, noting that western nations nonetheless wanted to enact laws to make sure that seizing the Russian property complied with their home legal guidelines.

The Treasury secretary declined to endorse an method, saying allies ought to act collectively.

Mr. LeMaire mentioned on Wednesday that the countermeasures idea was inadequate.

“We must always actually perceive that taking such vital choice, which is to reap the benefits of the state property, wants a really sturdy authorized foundation,” he mentioned.

He went on to argue {that a} transfer to grab Russian property ought to have the assist of the G20, a threshold that’s unrealistic as a result of Russia is a member of that group.

“We must always not add any type of division among the many G20 nations,” Mr. LeMaire mentioned. “You’ll create extra division at a time the place we’d like extra unity to assist Ukraine.”

Eshe Nelson contributed reporting from London and Monika Pronczuk from Brussels.