It is not clear the US is actually proposing Nato membership – the White House has not yet replied to a request for comment and it is understood that Ukraine itself sees that as unrealistic.
Other Nato members are wary and the Kremlin has always been fiercely opposed. It is one reason why Russia started this war in the first place.
It is possible the American envoys were exploring Ukraine’s “red lines” when it comes to occupied land in the Donbas. Zelensky said recently that the US mediators believed Kyiv only had to cede territory to achieve peace and were applying pressure, keen to do a deal as soon as possible.
Ukraine is sure that Russia’s ambitions are far greater and has long seen Nato as its only sure protection.
So it is also possible that Zelensky made this suggestion public in order to re-open a discussion that had been considered all-but closed.
He maintains that the idea is now “back on the agenda” as part of an “extremely difficult conversation” on European security.
It also looks like Ukrainian push-back against Russia’s renewed hardline stance. Moscow now talks about a “new European security architecture”, which is long-standing Russian code for a weaker Nato.
The issue appears to have been the main focus at the latest round of talks between Ukraine, Russia and the US in Abu Dhabi this week.
Russia has insisted again that it will not agree to cease fighting until a final peace deal is in place that would include handing over territories its troops have not captured, in addition to the Crimean peninsula it annexed illegally in 2014.
Russia currently occupies roughly a fifth of Ukrainian territory, including most of the Donetsk and Luhansk regions that compose the Donbas.
The latest round of talks come after a period of fraught relations between Kyiv and Washington over Ukrainian strikes on oil facilities deep inside Russia, which Trump had asked Ukraine to pause to facilitate the supply of Russian diesel to ease global fuel prices.
Zelensky then accused US officials of limiting Ukraine’s Starlink internet service, which it uses to co-ordinate defensive operations, while Trump said it was “time for Ukraine to get a new president” and called for fresh elections.
Elections are suspended while Ukraine remains under martial law, but Zelensky has previously said he was willing to hold them within months of a peace deal being reached and would give up the presidency in exchange for Nato membership.