Wladimir Klitschko has accused David Haye of being "afraid" of him and his brother.
The British heavyweight currently holds the WBA title - the one major belt that Wladimir and his older sibling Vitali don't have in their possession.
Haye, who defended his crown against John Ruiz earlier this year, has talked about unifying the division before he hangs up his gloves.
He had been due to fight Wladimir last summer but a back injury forced him to pull out while talks with Vitali also stalled. Both brothers have since come out and put a 50-50 offer on the table to tempt him.
Running scared
Now the younger of the two Klitschkos has told Sky Sports News that he feels the Londoner is running scared, despite the fact he "owes" it to boxing fans to get a deal done to take on either of the brothers.
"The guy talks a lot but there is no action - he doesn't follow through with everything that he promises," he said.
"He's actually sitting back somewhere in England or Cyprus, where he also lives, and not doing anything.
"I'm very disappointed about David Haye. I've actually had enough of him."
When asked if either he or his brother want to fight Haye, Wladimir added: "The actual question is whether he wants to fight us.
"He speaks a lot, saying 'yes, I want it (a fight with one of the Klitschkos)'.
"But then the deal wasn't good enough, his shoes were too small, or his back was injured, or whatever else he is going to create (as an excuse).
"Unfortunately there is no action. I'm seriously disappointed by David Haye. It's not only his financial interests; there are boxing fans out there and he owes this fight to them especially.
"He is running out of time because he said he wanted to retire at 30 or 31 - I don't know what his plans are but he will run out of time, and respect first of all.
"I believe he is afraid. If he wasn't afraid he would take the fight."
No response
Wladimir also blasted Haye, who was in George Groves' corner in Las Vegas at the weekend, for his lack of a response to being called out via a video he posted earlier this year on YouTube.
"I called him out on YouTube, telling him 'let's do it - put your emotions to one side and let's get in the ring'," he added.
"He never gave any response to me; he just quietly sat back and didn't do anything."
Klitschko was speaking at the friendly between Eintracht Frankfurt and Chelsea at the Commerzbank Arena, the venue where he will defend his WBO, IBF and IBO belts against Nigerian Samuel Peter on September 11.
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