German Chancellor Friedrich Merz and Ukrainian President Volodymyr Zelenskyy accused Russia of stalling diplomatic efforts to achieve a cease-fire at a joint news conference in Berlin on May 28.
The two leaders also announced that their countries would begin joint production of long-range weapons to boost Ukraine's ability to fight.
"They (Russians) will constantly look for reasons not to end the war," Zelenskyy said, adding "you can see what [Russian President Vladimir] Putin is doing."
"There are mass drone attacks every night. The Russians use dozens of cruise missiles, ballistic missiles, hundreds of drones," he added.
"The memorandum on talks, which Putin promised more than a week ago, has still not materialized. The massive air strikes, especially on Kyiv at the weekend, are not the language of peace," said Merz.
"They are a slap in the face for everyone who is working for peace, in Ukraine, in Europe, and in the United States," he added.
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Their comments came added to a growing sense on both sides of the Atlantic that efforts to get negotiations moving are being blocked in Moscow.
They follow a social media post by US President Donald Trump the previous day, warning that Putin was"playing with fire."
"What Vladimir Putin doesn't realize is that if it weren't for me, lots of really bad things would have already happened to Russia," he wrote.
Trump's post followed a weekend in which Russia launched itslargest air attacksince beginning its full-scale invasion in 2022.
