Former commander of Colombia's rebel group Farc, Iván Márquez, released a video six months after hiding.
In the film, he accuses the government of betraying the terms of the historic peace agreement signed in 201
He says 400 community leaders and 85 former combatants have been killed since the peace agreement was signed .
Mr. Márquez led the Farc negotiating team in the talks, which were held in Cuba and lasted four years.
Farc has always claimed to fear reprisals from those who opposed the peace process.
In April, one of the older leaders, Jesús Santrich, was arrested at the request of the United States, accused of drug trafficking.
Shortly thereafter, Mr. Márquez resigned from his seat in the Colombian Senate and hid himself.
Mr. Márquez does not reveal where he was during the 12-minute video, which he prepared for the 24th Rosa Luxemburg International Conference in Berlin.
The Farc, or Revolutionary Armed Forces of Colombia, is now a political party known as the Common Revolutionary Forces with five seats in the Senate and five in the House of Representatives.
"The results are discouraging"
Mr. Márquez declared that the leftist group made a crucial mistake during the final phase of the negotiations: "We agreed to lay down arms before obtaining an agreement on the matter. political, economic and social integration of the combatants. "
But the former commander, whose real name is Luciano Marín, said he remained faithful to the peace and full implementation of the agreement
"On 24 November 2016 it was signed at the • Havana's definitive agreement to end the conflict and stable and lasting peace, "he said.
"Only two years later, government results in terms of implementation are daunting."
President Iván Duque's government says it is taking steps to increase compassion for former rebels.
Mr. Duque, a voice critic of the peace agreement, took office in August.
He replaced Juan Manuel Santos, who won the Nobel Peace Prize for his role in the agreement with the FARC, which ended more than five decades of conflict.
A week ago, the head of the UN, António Guterres, urged President Duque to do more to protect former rebels.
He said that many of them had been killed by illegal armed groups and gangs of drug traffickers.
Farc's 52-year-old fight
1964: Set up as an armed wing of the Communist Party
2002: Al its peak, it had an army of 20,000 fighters who controlled up to a third of the country. Senator Ingrid Betancourt kidnapped and held for six years along with another 14 hostages
2008: Farc suffers a series of defeats in its worst year
2012: of peace speaks to Havana
2016: The definitive cease-fire