UCDP External Support Dataset

The share of armed conflict-dyads or intrastate conflicts that receive at least one form of external support from state or non-state actors in a given time period. ESD documents: 80% of all intrastate conflicts (1975-2017) received external support; 72% of interstate conflicts. External support is the rule, not the exception, in modern armed conflict.

External support provided to government forces (rather than rebel groups) in intrastate conflicts. After 9/11, the share of conflict-dyads with exclusively rebel-sided support fell to near zero by 2016, while government-sided support reached 77% of all active conflict-dyads by 2017. Reflects the international anti-terrorism norm shift that reframed rebel groups as terrorist organizations.

External support involving deployment of foreign troops for combat operations on behalf of a recipient party. Coded separately from indirect support (weapons, training, funding, intelligence, logistics). Direct intervention first exceeded indirect support in 2015 and continues to grow. Conceptually distinct from delegation/orchestration framing by requiring actual combat role.

Three or more states coordinating their provision of external support to achieve a common goal. Coalition-based support was rare before 2001 (Gulf War Coalition 1990-91 is the first recorded instance) but grew dramatically after 9/11, reaching nearly one-third of all support instances by 2017. Implications for effective principal discipline over rebel recipients.

An armed opposition organization or rebel group that provides external support to another warring party in a different conflict. ESD is the first global dataset to systematically track non-state actors as supporters (not just recipients). Non-state supporters peaked at 38 active groups in 2012 (including al-Shabaab training Boko Haram). More than a quarter of all support to rebel groups comes from non-state actors.

80% of all intrastate conflicts (1975-2017) saw at least one instance of external support (Table II). External support is structurally ubiquitous in modern armed conflict, making the absence of support a more analytically interesting condition than its presence.

The number of external supporters in active conflicts more than doubled from fewer than 60 in the 1975-1998 period to over 120 from the early 2000s onward (Figure 3), reflecting growing internationalization of civil conflicts rather than growth in the number of conflicts themselves.

Post-9/11 shift: rebel-sided external support nearly disappeared by 2016 while government-sided support reached 77% of all active conflict-dyads by 2017 (Figure 4). The Global War on Terror reframed rebel support as state sponsorship of terrorism, raising reputational costs of backing non-state groups.

Direct military support (troop deployment) first exceeded indirect support (weapons/training/funding) in 2015 and continues growing (Figure 5), contrary to the common assumption that proxy warfare means primarily indirect engagement. The rise coincides with counter-terrorism operations and light-footprint warfare doctrine.

Training and expertise is the most common support type overall (Figure 1); rebels and governments receive systematically different support: governments receive more troops and joint operations, rebels receive more weapons and training. Non-state-to-non-state support (rebel groups supporting other rebel groups) accounts for more than 25% of all rebel support.

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