Vice President J.D. Vance on Wednesday warned the Ukrainian president against attacking President Donald Trump, saying that 'badmouthing' him in public would only backfire.

Vance spoke to DailyMail.com hours after Ukrainian President Volodomyr Zelensky accused Trump of living in a Russian-made 'disinformation space.'

The extraordinary language on both sides comes at a critical time in the war between Ukraine and Russia, as Trump pushes for a speedy resolution. 

'The idea that Zelensky is going to change the president's mind by badmouthing him in public media ... everyone who knows the president will tell you that is an atrocious way to deal with this administration,' said Vance during an exclusive interview in his West Wing office.  

At the same time, Trump weighed in with his own attack on Truth Social.

'A Dictator without Elections, Zelensky better move fast or he is not going to have a Country left,' he wrote. 

It marks an extraordinary breakdown in relations between Washington and Kyiv. 

Vance said Zelensky had been getting 'bad advice' on how to deal with the new administration and for the past three years had been told he could do nothing wrong. 

'We obviously love the Ukrainian people. We admire the bravery of the soldiers, but we obviously think that this war needs to come to a rapid close,' he continued.

'That is the policy of the President of the United States. It is not based on Russian disinformation. It's based on the fact that Donald Trump, I think, knows a lot about geopolitics and has a very strong view, and has had a strong view for a very long time.' 

Trump kickstarted the new push for peace last week in a 90-minute call with Russian President Vladimir Putin.