A recent InSight report revealed that three of the ELN’s five main fighting divisions operate from Venezuelan territory, using it for logistics, training and cross-border movement
Colombia’s National Liberation Army (ELN) and dissident factions of the former FARC rebel group issued defiant statements following the U.S. military operation in Venezuela that led to the capture of Nicolás Maduro, framing the attack as a violation of regional sovereignty and vowing armed resistance against Washington.
In a statement released by its Eastern War Front, the ELN said that “once again U.S. imperialism violates the national sovereignty of the countries of Our America and the world,” and rejected what it described as a U.S. attack on the “Bolivarian Republic of Venezuela.”
The group expressed “solidarity and support for the Venezuelan people and government” and called on Latin American nations to “reject the gringo aggression, defend national sovereignty, and embrace unity and popular resistance,” as Infobae reports.


It does actually, but against an invading army. There are reports of Russian fighters having trouble executing orders because the “enemy” also spoke Russian in some instances of the Ukraine/Russia war.
When there is a common language, the people sent to fight might notice there is more in common between them and the people on the other side than with the people in power that sent them there to die if needed.