Vladimir Putin is open to discussing a Ukraine cease-fire deal with Donald Trump but rules out making any major territorial concessions and insists Kyiv abandon ambitions to join NATO, five sources with knowledge of Kremlin thinking told Reuters.

President-elect Trump, who has vowed to swiftly end the conflict, is returning to the White House at a time of Russian ascendancy. Moscow controls a chunk of Ukraine about the size of the American state of Virginia and is advancing at the fastest pace since the early days of the 2022 invasion.

In the first detailed reporting of what President Putin would accept in any deal brokered by Trump, the five current and former Russian officials said the Kremlin could broadly agree to freeze the conflict along the front lines.

There might be room for negotiation over the precise carve-up of the four eastern regions of Donetsk, Luhansk, Zaporizhzhia, and Kherson, according to three of the people who all requested anonymity to discuss sensitive matters.

While Moscow claims the four regions as wholly part of Russia, defended by the country’s nuclear umbrella, its forces on the ground control 70-80% of the territory with about 26,000 square km still held by Ukrainian troops, open-source data on the front line shows.

Russia might also be open to withdrawing from the relatively small patches of territory it holds in the Kharkiv and Mykolaiv regions, in the north and south of Ukraine, two of the officials said.

Putin said this month that any cease-fire deal should reflect the “realities” on the ground but he feared a short-lived truce which would only allow the West to rearm Ukraine.

“If there is no neutrality, it is difficult to imagine the existence of any good-neighborly relations between Russia and Ukraine,” Putin told the Valdai discussion group Nov. 7.

“Why? Because this would mean that Ukraine will be constantly used as a tool in the wrong hands and to the detriment of the interests of the Russian Federation.”

Two of the sources said outgoing President Joe Biden’s decision to allow Ukraine to fire American ATACMS missiles deep into Russia could complicate and delay any settlement – and stiffen Moscow’s demands as hardliners push for a bigger chunk of Ukraine. Kyiv used the missiles Tuesday to strike Russian territory for the first time, according to Moscow which decried the move as a major escalation.

If no cease-fire is agreed, the two sources said, then Russia will fight on.

“Putin has already said that freezing the conflict will not work in any way,” Kremlin spokesman Dmitry Peskov told Reuters hours before the Russians reported the ATACMS strikes. “And the missile authorisation is a very dangerous escalation on the part of the United States.”

The Ukrainian foreign ministry didn’t immediately respond to a request for comment for this article.

Trump’s communications director Steven Cheung told Reuters about the incoming U.S. president: “He is the only person who can bring both sides together in order to negotiate peace, and work towards ending the war and stopping the killing.”

Real estate billionaire Trump, author of the 1987 book “Trump: the Art of the Deal,” has said he would speak directly to Putin in his efforts to forge a peace deal, though has given no details on how he might reconcile the warring sides, which both show scant sign of backing down.

Ukrainian President Volodymyr Zelenskyy has said his country will not rest until every last Russian soldier is ejected from its territory – based on the borders it gained after the 1991 fall of the Soviet Union – though top U.S. generals have said publicly that this is a very ambitious aim.

Putin set out his opening terms June 14 for an immediate end to the war: Ukraine must drop its NATO ambitions and withdraw all of its troops from the entirety of the territory of four Ukrainian regions claimed and mostly controlled by Russia.

Security Guarantees, Army Limits

While Russia will not tolerate Ukraine joining NATO, or the presence of NATO troops on Ukrainian soil, it is open to discussing security guarantees for Kyiv, according to the five current and former officials.

Other Ukrainian concessions the Kremlin could push for include Kyiv agreeing to limit the size of its armed forces and committing not to restrict the use of the Russian language, the people said.

Dimitri Simes, who emigrated to the United States from the Soviet Union in 1973 and is one of Russia’s best-connected experts on America, said a ceasefire agreement could be struck relatively swiftly to end the war, which has killed hundreds of thousands of soldiers and displaced millions of civilians.

But a wider, lasting deal that addressed both Ukraine and Russia’s security concerns would be extremely challenging to forge, he added.

“A grand bargain, in my view, would be very difficult to reach as the positions of the two sides are very far apart.”

‘Harsh Truth: Russia Is Winning’

Russia controls 18% of Ukraine including all of Crimea, a peninsula it annexed from Ukraine in 2014, 80% of the Donbas – the Donetsk and Luhansk regions – and more than 70% of the Zaporizhzhia and Kherson regions. It also holds just under 3% of the Kharkiv region and a sliver of Mykolaiv.

In total, Russia has over 110,000 square km of Ukrainian territory. Ukraine holds about 650 square km of Russia’s Kursk region.

Domestically, Putin could sell a cease-fire deal that saw Russia hold onto most of the territory of Donetsk, Luhansk, Zaporizhzhia, and Kherson as a victory that ensured the defense of Russian speakers in eastern Ukraine and safeguarded the landbridge to Crimea, according to one of the sources.

The future of Crimea itself is not up for discussion, all the Russian officials said.

One of the officials, a senior source with knowledge of top-level Kremlin discussions, said the West would have to accept the “harsh truth” that all the support it had given Ukraine could not prevent Russia from winning the war.

Putin, a former KGB lieutenant colonel who watched the Soviet Union crumble while stationed in Dresden, took the decision to invade Ukraine himself with only limited counsel from a tiny group of trusted advisers, 10 Russian sources with knowledge of Kremlin thinking told Reuters.

He will likewise have the deciding voice on any cease-fire, according to the five current and former officials.

The Kremlin chief presents what he calls the “special military operation” in Ukraine as a watershed moment when Moscow finally stood up to what he sees as the arrogance of the West which enlarged NATO eastwards towards Russia’s borders and meddled in the politics of what Moscow considers as its own backyard, including Georgia and, crucially, Ukraine.

Kyiv and the West say the invasion was an attempt to grab sovereign Ukrainian territory.

When asked what a possible ceasefire might look like, two of the Russian sources referred to a draft agreement that was almost approved in April 2022 after talks in Istanbul, and which Putin has referred to in public as a possible basis for a deal.

Under that draft, a copy of which Reuters has seen, Ukraine should agree to permanent neutrality in return for international security guarantees from the five permanent members of the U.N. Security Council: Britain, China, France, Russia and the United States.

One of the Russian officials said there would be no agreement unless Ukraine received security guarantees, adding: “The question is how to avoid a deal that locks the West into a possible direct confrontation with Russia one day.”