A few days ago some dissident FARC leaders announced they'll return to armed struggle and seek an alliance with the ELN, another insurgent group. They are in Venezuela and have been to Cuba recently. For a long time Venezuela has backed those groups and allowed them to operate and make money in their territory.
If anyone should invade Venezuela it's Colombia. Chavismo has directly or indirectly interferred with internal Colombian affairs, always for the worse, supporting terrorism and creating a heavy refugee burden.