Sunday’s negotiations in Florida between the US and Ukraine on Sunday focused on where the de facto border with Russia would be drawn under a peace deal, two Ukrainian officials tell Axios. They described the five-hour meeting as "difficult" and "intense," but productive, Axios reports.

Russian President Vladimir Putin — who's expected to meet with US President Donald Trump's envoy on Tuesday — insists Russia won't stop until it controls the entire Donbas region.

The US wants Ukraine to hand over territory there to convince Putin to make peace, but that would be a “painful and politically explosive concession” for Ukraine.

After an hour in a wider format, the meeting narrowed to three officials from each side — with the line of territorial control virtually the only issue discussed, according to the two Ukrainian officials.

On the US side were Witkoff, Secretary of State Marco Rubio and Trump's adviser and son-in-law Jared Kushner. The Ukrainian side was represented by national security adviser Rustem Umerov, military chief of staff Gen. Andrii Hnatov and deputy head of military intelligence Vadym Skibitskyi.

After the talks with their teams ended, Umerov held another one-on-one meeting with Witkoff. Umerov then called Ukrainian President Volodymyr Zelenskyy to brief him on the talks.

"It was intense but not negative. We really appreciate serious US engagement. Our position is that we have to make everything to help US succeed without losing our country and preventing another aggression from happening," one of the Ukrainian officials wrote to Axios after the meeting.

Trump told reporters aboard Air Force One on his way back from Florida to Washington on Sunday that he was briefed about the results of the negotiations and thinks "there's a good chance we can make a deal."

Witkoff plans to depart for Moscow on Monday and meet Putin on Tuesday.

"The main question is where the Russians stand and if their intentions are real. Let's see what Witkoff brings from Moscow," a Ukrainian official said.