European officials rejected Russian President Vladimir Putin’s calls that Ukraine give up territories annexed during the war — instead demanding Saturday an immediate ceasefire from Moscow and NATO membership for Kyiv.

The counter-offer demands rock-solid security guarantees for Ukraine — namely the long-coveted membership in NATO for the war-torn country before any territorial concessions, sources familiar with the talks told The Post.

Ukraine has been seeking NATO membership since 2008 — eyeing it as a shield against future Russian aggression. 

If Putin were to attack a NATO member it would compel all others member countries to respond with military force — under its defense pact — a move that could ignite a global war.

The European plan – put forward by the UK, France, Germany and Ukraine — also proposes that any land exchange must be reciprocal. If Ukraine removes troops from some regions, Russia must pull out of others.

And a cease-fire agreement would need to be reached before any other steps are taken.

“You can’t start a process by ceding territory in the middle of fighting,” one European negotiator told the Wall Street Journal.

UK Foreign Secretary David Lammy, Vice President JD Vance and senior Ukrainian officials met Saturday to discuss Putin’s proposal.

“The UK’s support for Ukraine remains ironclad as we continue working towards a just and lasting peace,” Lammy posted Saturday on X.

Secretary of State Marco Rubio, Special Envoy Steve Witkoff and Ukraine Envoy Keith Kellogg were also consulted.

President Trump had acknowledged “there will be some swapping of territories to the betterment of both” in a press conference at the White House Friday.

Earlier this week, Putin told Witkoff he would agree to end the war in exchange for the Ukrainian region of Donetsk, according to the Journal.

It’s one of five regions in the south of Ukraine currently under the Russian strongman’s control that’s been targeted by constant air strikes since the start of the more than three-year-old conflict.

Russia currently has full control of the neighboring Luhansk region as well as the Crimean peninsula, but the annexations are not internationally recognized and considered illegal under international law. 

Two other regions, Kherson and Zaporizhzhia are under partial Russian occupation.

The European deal is meant to serve as a framework for negotiations between Putin and President Trump in Alaska on Friday.

The deal is meant to serve as a framework for negotiations between Putin and President Trump in Alaska on Friday.

“The future of Ukraine cannot be decided without the Ukrainians who have been fighting for their freedom and security for over three years now,” French President Emmanuel Macron wrote on X.

Zelensky was not invited to the Alaska summit between Trump and Putin.

The Russian ruler had previously called for the total demilitarization of Ukraine and replacement of its current government, as well as more Kyiv-controlled regions to be ceded to Moscow.

The Post reached out to reps for the White House, Vance, Rubio and Witkoff for comment.