Prosecutors in New York accuse partially-sighted Santrich of conspiring to ship 10,000 kilograms of cocaine to the United States while serving as a senior member of the leadership of the Revolutionary Armed Forces of Colombia (FARC).
Ecuador's President Lenin Moreno says retaliatory military operation has been launched following confirmation of deaths of three members of a journalist team kidnapped by renegade Colombian rebels last month.
Seusis Hernandez, known by his nom de guerre Jesus Santrich, was arrested for conspiring to export 10 tonnes of cocaine, worth $320 million, to the US.
The talks were suspended by Colombian President Juan Manuel Santos in January after a series of bombings by the National Liberation Army.
Calmest polls in half a century of conflict in Colombia, with the former rebel movement FARC spurning jungle warfare for politics, and the ELN – the country's last active rebel group – observing a ceasefire.
Colombians are heading to the polls to elect a new Congress with a resurgent right, bitterly opposed to a peace deal that allows leftist former rebels to participate, expected to poll strongly.
After more than five decades of fighting and atrocities during the country's war with FARC, the former rebels are finding it difficult to persuade the public to vote for their party.
The FARC announced that they will halt campaign events until their safety can be sufficiently assured.
Recent opinion polls show just two percent support for the party, with many Colombians angry at the FARC, infamous for kidnappings, bombings and displacements, and believing its members should be in prison, not campaigning.
Rodrigo "Timochenko" Londono was once one of Colombia's most-wanted men. Now he is a presidential contender.
Colombia's upcoming elections might be turning into another referendum on the peace deal with the FARC.
Guterres was in Bogota on Saturday to throw his weight behind the peace deal between Colombia and FARC rebels, calling peace the solution to poverty in the South American nation.
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