Ukraine President Volodymyr Zelenskyy said Wednesday that President Donald Trump is living in a Russian "disinformation space" regarding his previous day's comments about the Ukrainian leader's approval rating.

Trump said at Mar-a-Lago that Zelenskyy's rating stood at 4%.

Zelenskyy replied in a news conference in the Ukrainian capital Kyiv that "we have seen this disinformation. We understand that it is coming from Russia."

He said that Trump "lives in this disinformation space."

Trump also suggested Ukraine ought to hold elections, which have been postponed due to the war and the consequent imposition of martial law, in accordance with the Ukrainian Constitution.

Public opinion polls and approval ratings have not been reliable in Ukraine because of the fighting.

Zelenskyy made the comments shortly before he was expected to meet with Keith Kellogg, the U.S. special envoy for Ukraine and Russia, who arrived in Kyiv on Wednesday. Kellogg will meet Zelenskyy and military commanders as the U.S. shifts its policy away from years of efforts to isolate Russian President Vladimir Putin.

Trump suggested Tuesday that Kyiv was to blame for the war, which enters its fourth year next week, as talks between top American and Russian diplomats in Saudi Arabia sidelined Ukraine and its European supporters.

Trump's comments are likely to vex Ukrainian officials, who have urged the world to help them fight Russia's full-scale invasion that began Feb. 24, 2022.

The battlefield has also brought grim news for Ukraine in recent months. A relentless onslaught in eastern areas by Russia's bigger army is grinding down Ukrainian forces, which are slowly but steadily being pushed backward at some points on the 1,000-kilometer (600-mile) front line.

Trump told reporters at his Florida residence Tuesday that Ukraine "should have never started" the war and "could have made a deal" to prevent it.

Kellogg said his visit was "a chance to have some good, substantial talks." Zelenskyy canceled his planned Wednesday trip to Saudi Arabia in what some analysts saw as an attempt to deny legitimacy to the U.S.-Russia talks about the future of his country.

American officials have signaled that Ukraine's hopes of joining NATO in order to ward off Russian aggression after reaching a possible peace agreement won't happen. Zelenskyy says any settlement will require U.S. security commitments to keep Russia at bay.

"We understand the need for security guarantees," Kellogg said in comments carried by Ukrainian public broadcaster Suspilne Novyny on his arrival at Kyiv train station.

"It's very clear to us the importance of the sovereignty of this nation and the independence of this nation as well. ... Part of my mission is to sit and listen," the retired three-star general said.

Kellogg said he would convey what he learns on his visit to Trump and Secretary of State Marco Rubio to "and ensure that we get this one right."