HAVANA/BOGOTA (Reuters) - Colombia's Marxist rebels called a two-month unilateral ceasefire on Monday, the first truce in more than a decade, as delicate peace talks began in Cuba to try and end a half century of war.
President Juan Manuel Santos' government has so far rejected any stoppage of military operations until a final peace deal is signed with the Revolutionary Armed Forces of Colombia, or FARC, and even vowed to step up the offensive.
The FARC said it would halt all offensive military operations and acts of sabotage against infrastructure beginning at midnight on Monday and running through January 20.
"This decision by the FARC is a decisive contribution to strengthen the climate of understanding needed so the parties ... can achieve the purpose desired by all Colombians," lead FARC negotiator Ivan Marquez said, standing outside a convention center for the start of talks in Havana.
The gesture is a sign that the rebels may be keen to push talks forward to a successful end, something that was thrown into doubt by long, drawn-out speeches by its leadership calling for major changes to Colombia's political system.
The warring sides arrived at the site of talks in black luxury cars and will meet almost daily until negotiations end.
A crush of journalists surrounded the bearded and bespectacled Marquez who stood with other FARC delegates including Dutch national Tanja Nijmeijer in Havana's plushest neighborhood.
Some FARC members wore caps and T-shirts of Simon Trinidad, an official guerrilla negotiator who is in prison in the United States. Others shouted "Long Live the Army of the People."
The head of the government's delegation, Humberto de la Calle, smiled and waved as he entered but gave no declaration.
Officials want the talks held in the strictest possible secrecy, which is likely one reason they are in communist Cuba, where the government is expert at controlling information.
Colombia's war has dragged on for 50 years, taking thousands of lives, displacing millions more and causing damage to infrastructure in Latin America's longest running insurgency.
Failure of the peace process would mean years of more fighting and further blight on the reputation of a country eager for foreign investment and regional clout, yet which has been unable to resolve its most serious domestic problem.
Residents in western Cauca province, one of the nation's most war-ravaged areas, celebrated the FARC ceasefire.
"We hope it's not just two months, we hope that it's definitive," Orlando Ramos, a resident in Miranda, Cauca, said on local television.
"GRAIN OF SALT"
The announcement by the FARC could be a breather for oil and mining companies, the target of many FARC attacks in recent months as the group sought to hobble Santos' main source of international revenue.
The war costs Latin America's fourth-largest economy 1 to 2 percentage points of gross domestic product every year, according to the government, and makes large tracts of arable land unsafe due to combat or landmines.
"A peace agreement with the FARC could entice more sectors and investors into Colombia," Eurasia Group's Latin America analyst Heather Berkman said.
"The opportunities for agriculture production in particular could reshape the country's export sector, particularly as both small scale and larger farmers could produce on land long off-limits due to security troubles."
Santos wants an agreement within nine months, while rebels say the process will likely take longer. The two sides face plenty of thorny issues in their five-point agenda, which will begin with rural development.
Previous peace attempts have failed, but both the government and the FARC express optimism that this time might be different.
Not everyone is so upbeat though.
"You have to take this announcement with a grain of salt," Felix Lafaurie, head of Colombia's National Federation of Cattle Ranchers, said on Colombian radio.
"I hope this is going to be a sign of the FARC's good will and not that they'll then take swipes on substantive issues."
The vast majority of Colombians support the peace process, although they think it will ultimately fail, but even so, the talks are the biggest gamble in Santos' political career and their success or failure may decide the next election in 2014.
The conflict dates back to 1964 when the FARC emerged as a communist agrarian movement intent on overturning Colombia's long history of social inequality and it hit its strongest point during the 1990s when it controlled swathes of the country.
In the early 2000s, billions of dollars in U.S. aid, better intelligence and increased mobility began to turn the tide of the war in favor of the government.
The FARC has lost at least half a dozen top commanders and been pushed back into remote jungle hideouts in recent years, though the rebels are far from a spent force and still wage attacks on security forces and economic infrastructure.
Violence was among the reasons previous talks failed. In the last attempt from 1999 to 2002, the government broke off negotiations after the FARC hijacked an airplane.
"The FARC have heard the voice of many Colombians, that rightly have been skeptical about its willingness to reach an end to the war, given the past," said Juan Fernando Cristo, a senator for the Liberal Party.
"The decision for a unilateral truce should fill us with optimism about what's coming at the negotiating table." (Additional reporting by Jack Kimball, Helen Murphy, Nelson Bocanegra, Monica Garcia and Luis Jaime Acosta in Bogota; Writing by Jack Kimball; Editing by Jane Sutton and Cynthia Osterman)
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