Colombian rebels have been relying on drug trafficking to finance their murderous enterprise. Thanks to the War on [some] Drugs they have a ready profitable market.
U.S. and Colombian authorities are aware of this, and they've stepped up efforts to eradicate coca trade in Colombia. The result?
Colombia's largest rebel group is growing coca -- the raw material for cocaine -- over the border in northern Peru, an area that has not typically been used to grow coca, Peruvian Defense Minister Roberto Chiabra said on Friday.
"There is an increase in cultivation of coca leaf in our territory which requires an operation (to prevent it)," he said during a visit to the southern city of Ayacucho.
It's sort of like squeezing one end of a balloon.
or like this.