Well it's bad for Columbia. Hugo is already harboring, aiding and abetting FARC.
You have to remember that after Castro Hugo's next hero is Che. IMHO he'd like nothing more than to reinvent Che's dream of "The Liberation of Latin America" Which would entail guerillia warefare throughout Latin America with new Republics to be ruled by his (and Fidels) brand of Psuedo-Socialism.
He's already fanning flames in Southern Mexico and who do you think was behind Evo Morales in Boliva?