"We've given a lot to Ukraine. They've given nothing to us," Trump told reporters in Washington on Monday.
He was speaking after Ukrainian President Volodymyr Zelenskiy complained about Washington withholding weapons deliveries and vital intelligence.
Meanwhile, Reuters reports US special envoy Steve Witkoff will travel to Norway this week for negotiations on ending the war in Ukraine.
The Oslo discussions are expected to include Zelenskiy, Norwegian Prime Minister Jonas Gahr Store, representatives of the E4 - made up of Britain, France, Germany, and Poland - the European Union, and NATO.
The meetings come amid increased tensions between Washington and Kyiv.
Ukraine alleges the US administration ordered a reduction in the speed of its Starshield military-grade satellite system, owned by SpaceX, and that the US had limited intelligence sharing and delayed delivery of Patriot air defence missiles.
"All of this suggests that some political decision has been made to slow down support for us," Zelenskiy said in a video posted on X.
US officials have denied Ukraine's allegations.
One of the people familiar with the matter said that US Secretary of Defense Pete Hegseth had yet to authorise delivery of the latest package of US weaponry purchased by NATO allies under a program known as PURL, but could not confirm that it included Patriots.
Trump accused Zelenskiy of refusing to hold peace talks with Russia, saying maybe it was time the Ukrainian leader "get somebody else to negotiate".
Ukraine uses Starshield for battlefield communications and drone operations.
The US Defense Department holds the Starshield contract with SpaceX but allows Ukraine to use the system.
Ukrainian officials have said the throttling of Starshield led to civilian deaths because the military was unable to intercept Russian strikes.
A senior US Defense Department official told dpa there had been no changes to the program under which NATO countries purchase US weapons for Ukraine.
Zelenskiy also reported details of "a horrific Russian strike" in the Kharkiv region on Monday.
"A "shahed" struck people directly - in a park near an ordinary café. Pure atrocity. Six people were killed, including children. A little girl was killed in a stroller," he said on X.
Trump also stepped up his criticism of Kiev after Zelenskiy suggested that the US president's Kremlin-friendly approach put him on the wrong side of history.
"Zelenskiy doesn't know what he's talking about," Trump responded.
with Reuters
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