Trump reiterated that he was "very unhappy" with the July 3 phone call between the two leaders.
"It just seems like he wants to go all the way and just keep killing people.
The call, which lasted about an hour, was confirmed by the Kremlin to have focused on Ukraine.
Putin reportedly told Trump that Russia would continue pursuing its "goals" in the war.
The strikes have hit multiple regions, destroying civilian infrastructure amid persistent calls from Ukraine, the U.S., and Europe for an unconditional ceasefire.
When asked why he appears tougher on Tehran than Moscow, Trump told reporters, "No, I think I'm tougher on Russia than I am on Iran.".
The negotiations have only resulted in prisoner exchanges, as Moscow continues to push for maximalist demands in peace talks. »