Russian President Vladimir Putin could be waiting a long time for an apology from Bill O'Reilly.
The Fox News host responded late Monday to an angry statement from the Kremlin over his description of Putin as "a killer."
"Apparently, the Putin administration in Moscow [is] demanding that I -- your humble correspondent -- apologize for saying 'Old Vlad' is a killer," O'Reilly said on his Fox show. "So I'm working on that apology, but it might take a little time. Might want to check in with me around 2023."
Earlier in the day, Putin's spokesman Dmitry Peskov had described O'Reilly's words as unacceptable and offensive.
The Fox host's response appears unlikely to satisfy Peskov's call for an apology "from such a respected TV company."
O'Reilly made the remark about Putin during an interview that aired Sunday with U.S. President Donald Trump.
When Trump said he respected Putin, O'Reilly responded: "He's a killer, though. Putin's a killer."
Trump fired back: "There are a lot of killers. You think our country's so innocent?"
The president's comments have also caused an outcry by appearing to equate U.S. actions with Putin's authoritarian regime.
O'Reilly, the top-rated host on Fox, is one of Trump's preferred interviewers. For the last five months of the presidential race, Trump spoke almost exclusively to O'Reilly and Fox's Sean Hannity.
But O'Reilly has been critical of Trump's positive descriptions of Putin's leadership.
"He's a bad guy," O'Reilly said of Putin in September. "And Trump is making him out like some golfing partner."
The Fox host has called Putin a killer in the past, but it appears his use of the word in the high-profile interview with Trump attracted Moscow's attention.
Peskov, the Putin spokesman, declined to comment on Trump's own remarks in the interview.