Ecuador is harboring a Columbian Terrorist Group, the FARC.
Ecuador, doesn't really harbor them, they just do nothing at all, to prevent them from building bases in thier territory.
Last week, Columbia attacked a FARC base that was inside Ecuador to kill a major FARC commander.
Of course, attacking anyone inside another nation, without that nations approval, is an iffy thing.
Compare that to the US launching an attack against al-quada members located inside Pakistan.
Most americans would think that was justified.
The US will not get into it, besides offering moral support, because we don't have to.
Columbia's military is alot larger than Ecuadors military, far better trained and equipped.
Even with Venezuela siding with Ecuador, Columbia still has a military twice as large as Venezeula and Ecuador combined, again, far better trained and equipped.
The leaders of both Ecuador and Venezuela both have publicly supported FARC and support thier goals.