During a lightning tour of six countries in five days next week, Santos will lobby for the creation of a European fund for the post-conflict period, should his government clinch a historic deal with the Revolutionary Armed Forces of Colombia (FARC).
"It's the oldest conflict in the Western world," Santos told AFP in an interview at the presidential palace in Bogota -- his first with an international news agency since his re-election in June.
The center-right leader is expected to discuss gains made in nearly two years of peace talks with the FARC when he meets with his counterparts in Belgium, Britain, France, Germany, Portugal and Spain.
The talks, which have been held in Cuba without a ceasefire on the ground in Colombia, have led to an agreement in principle on the need to fight drug trafficking -- an argument that should resonate in Europe.
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"Colombia has been the world's cocaine supplier for the past 35-40 years," stressed Santos.
"We have an image problem, that's for sure. But the facts speak loudest about our evolution," Santos said.
The leader of Latin America's fourth-largest economy, with 47 million inhabitants and forecast to record five percent growth this year, also plans to ask foreign investors to fund economic projects to help demobilized fighters reintegrate in society and find jobs.
The right-wing fighters have also played a role in Colombia's long-running conflict, which has left 220,000 people dead and displaced more than five million people in 50 years, according to official figures.
"If some of them think they will carry on as bandits, they will find the full force of the law will fall upon them," Santos warned.