From the Executive Summary: "Turkish president Recep Tayyip Erdoğan is faced with a dilemma: in order to avoid US sanctions, he must keep the S-400 system he purchased from Russia unopened, but doing so might open Turkey up to Russian sanctions. Erdoğan's worst nightmare is President Donald Trump following through on his threat last year to 'devastate the economy of Turkey.'"
BESA Center Perspectives Paper No. 1558; Begin-Sadat Center for Strategic Studies Perspectives Paper No. 1558
Begin-Sadat Center for Strategic Studies
Begin-Sadat Center for Strategic Studies: https://besacenter.org/