March 19, 2021
Negotiating [Im]plausible Deniability: Strategic Guidelines for U.S. Engagement in Modern Indirect Warfare
American adversaries such as Russia and Iran are persistently challenging U.S. interests around the world through indirect attacks. Rather than threaten the United States head-on, these competitors employ nebulous tools like private military contractors, proxies, and cyber-driven disinformation campaigns that are difficult to attribute, enabling plausible deniability, and muddle the distinction between violent and nonviolent actions. The frequency and ubiquity of these incidents—whether in Syria, Afghanistan, or even back home—suggest that indirect attacks will remain a primary tactic in geopolitical competition for the foreseeable future. Yet, the implications of these indirect means of competition for U.S. policy are not well understood. The centerpiece of these attacks is adversaries’ ability to threaten U.S. interests repeatedly over time and geographies while obfuscating the seriousness of the threat and keeping the acts below the threshold of public attention. We find that by mitigating domestic political pressure in the targeted state to react decisively, indirect attacks provide that state the benefit of decision space for how to respond. The aggregate implication for national security is that the use of indirect attacks may have the overall effect of reducing the level of conflict in the international system by increasing opportunities to offramp escalation. For this to be true, however, states must take advantage of the space to leverage other tools like diplomacy to reduce tensions.