The peace plan refers to the conflict that erupted in Ukraine in 2014, after President Viktor Yanukovych fled the country amid mass protests.
The filing says Mueller has accused Manafort of lying to investigators about sharing the data with Konstantin Kilimnik, a business associate who was indicted a year ago on charges that he tampered with potential witnesses.
And those portions revealed nuggets of information about Manafort's ties to Russian national Konstantin Kilimnik, who has been linked to the Kremlin.
But Mueller's office said Manafort had lied about at least five subjects, including his interactions with Kilimnik. And in a third redaction apparently gone wrong, defense lawyers revealed that Manafort may have greenlighted an unnamed third party to drop his name if that person secured a meeting with President Trump.
In the filing Manafort's lawyers said they would not seek an evidentiary hearing to contest Mueller's allegations of lying, arguing that such factual matters could be addressed in a pre-sentencing report.
Mueller claimed in a November 26 filing that Manafort breached his plea deal and "committed federal crimes by lying to the Federal Bureau of Investigation and the special counsel's office on a variety of subject matters".
That's according to a court filing from defense lawyers Tuesday responding to allegations that Manafort has repeatedly lied to special counsel Robert Mueller's team of investigators. Journalists quickly discovered that the redacted portions of the court documents could be read by simply copying the redacted text and pasting it elsewhere.
It also says that Manafort met with Kilimnik in Madrid and that they discussed a peace deal for Ukraine.
Kevin Downing, attorney for former Trump campaign chairman Paul Manafort, enters a hotel across from the U.S. District Court, in Alexandria, Virginia, on October 19, 2018.More news: Editor's Corner-With Samsung deal, Apple is finally dropping video distribution hints
The defence document acknowledges Manafort conceded he had met with Mr Kilimnik in Madrid only after being told that they had travelled to the city on the same day. He declined further comment on the filing.
The lawyers disputed any improper outreach to the Trump administration. Another question is whether Kilimnik here was functioning as an arm of Deripaska in his relationship with Manafort or as cutout for Russian intelligence-or, again, perhaps both.
Manafort's attorneys reported he has been suffering from severe gout, anxiety and depression - conditions that may have affected his ability to recall events during his tumultuous service on the Trump campaign.
Prosecutors said Manafort also lied about the circumstances of a $125,000 wire transfer in 2017.
Days before his second trial in a DC federal court was set to begin, Manafort flipped - admitting he masterminded an illegal scheme to lobby for Ukrainians and launder the revenue.
The inadvertent disclosures offered a rare glimpse into details that were meant to remain private while Manafort's lawyers and Mueller's office battle over whether Manafort has breached a plea agreement struck in September by lying.
Judge Amy Berman Jackson has ordered the government to provide a detailed factual basis about Manafort's lies, which is due January 14.
The judge in DC federal court who has overseen his case, Amy Berman Jackson, gave him the opportunity to respond before she would hold a hearing about the facts of the situation.