There is a rich body of theorizing on the diffusion of democracy across space and time. There is also an emerging scholarship on authoritarian diffusion. The dynamics of the interaction between external democratic and autocratic diffusion processes and their effects on national and sub-national political regime outcomes have received scant attention in the literature. Do democratic diffusion processes help counter external authoritarian influences? And, in contexts where external diffusion of democratic influences is weak, do we observe greater susceptibility to diffusion from regional autocracies that might in turn reinforce authoritarian practices and institutions in "recipient" states? To address these questions, we perform analysis of data from two original under-utilized data sets—a data set on the European Union (EU) aid to Russia’s regions and a data set with statistics on trade among post-Soviet states. We find that EU aid has the effect of countering external authoritarian influences that work through Soviet-era inter-regional economic ties.