His comments came after The Financial Times, citing people briefed on discussions, reported on Tuesday that Trump had privately encouraged Ukraine to step up deep strikes on Russia.
The newspaper added that Trump asked Zelenskiy whether he could strike Moscow if the US provided long-range weapons.
"No, he shouldn't target Moscow," Trump told reporters on the South Lawn of the White House when asked if Zelenskiy should attack the Russian capital.
Asked if he was willing to give long-range missiles to Ukraine as well as more defensive arms, he added: "No, we're not looking to do that."
Trump on Monday announced a toughened stance against Russia for its three-year-old war in Ukraine, promising a fresh wave of missiles and other weaponry for Ukraine.Â
He gave Russia 50 days to reach a ceasefire or face sanctions.
Asked if he was now on the side of Ukraine, Trump said, "I am on nobody's side," and then declared he was on "humanity's side" because "I want to stop the killing".
Trump defended the deadline he set for Russia to agree to a deal and head off tariffs and sanctions on countries that buy oil from Russia.
"I don't think 50 days is very long and it could be sooner than that," he said.
He did not say whether any talks were planned to try to work out a deal with Russia.
"At the end of the 50 days if we don't have a deal, it's going to be too bad," he said.
Kremlin spokesman Dmitry Peskov said at a briefing on Tuesday that Russia was considering its next steps.
"We will certainly need time to analyse the rhetoric from Washington," he said, the TASS news agency reported.
Meanwhile, Russian Deputy Foreign Minister Alexander Grushko said that NATO's arms deliveries to Ukraine showed that the alliance was interested in continuing the fighting.
with DPA
