On the Alaska summit, Kallas said that Putin got “everything he wanted” and that would impact his interest in negotiating a peace deal.
“He got such a welcoming and he wanted sanctions not to be put in place, which he also achieved.
“Putin is just laughing, not stopping the killing but increasing the killing,” Kallas said. “We are forgetting that Russia has not made one single concession.”
She added that the EU had put together the 19th package of sanctions to pressure the Russian leader into further discussions.
Meanwhile, Trump on Thursday set a two-week time frame for evaluating peace talks between Russia and Ukraine.
“I would say within two weeks we’re going to know one way or the other,” he said in a telephone interview with Todd Starnes, a host for right-wing media outlet Newsmax.
“After that, we’ll have to maybe take a different tack,” Trump said.
But Zelensky cast doubt on Putin showing willingness for a meeting with him.
In comments released to reporters on Thursday, reported by the Agence France-Presse news agency, Zelensky accused Russia of avoiding the “necessity” of holding a meeting between the two countries’ leaders.
“Current signals from Russia are, to be honest, indecent. They’re trying to avoid the necessity to meet. They don’t want to end this war.”
He also put pressure on Western allies, saying Ukraine would like to “have an understanding of the security guarantees architecture within seven to 10 days”.
“We need to understand which country will be ready to do what at each specific moment,” he added.
Zelensky has criticised the significant air attack by Russia early on Thursday, saying it was behaving as if there were no global efforts to stop the war.
Eleven different locations in Ukraine were hit, killing at least one and injuring more than a dozen in the western city of Lviv close to the Polish border.
A number of European leaders earlier echoed EU and Ukrainian views about Putin’s unwillingness to engage with a peace deal.
Finnish President Alexander Stubb said Putin was “rarely to be trusted”, and that he was sceptical about Putin eventually agreeing to a bilateral meeting with Zelensky.
French President Emmanuel Macron called the Russian leader “a predator, and an ogre at our doorstep” and expressed “the greatest doubt” that he would be willing to work towards peace.
Both leaders were in attendance at White House peace talks on Monday.
Zelensky has said he is willing to meet Putin “in any format”, but told reporters on Thursday that there was still no sign from Moscow that they “truly intend to engage in substantive negotiations”.