Various mediation efforts have failed in recent years as foes accuse President Nicolas Maduro of exploiting dialogue to buy time, while he says the opposition prefers violence.
Ledezma is the best-known detained opponent of leftist President Nicolas Maduro after Leopoldo Lopez, and had spearheaded street protests against the president in 2014.
Two former Caracas mayors Antonio Ledezma and fellow opposition leader Leopoldo Lopez were jailed after being accused of destabilising President Maduro government.
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