vement ▁is ▁Camb odia ▁in ▁ 1 9 7 0 , ▁and ▁he ▁shows ▁convin cing ly ▁( by ▁a ▁comparison ▁of ▁Iran ▁in ▁ 1 9 5 3 ▁and ▁ 1 9 7 9 , ▁and ▁of ▁Gu atem ala ▁in ▁ 1 9 5 4 ▁with ▁Sand in ista ▁Nic ar agua ) ▁that ▁US ▁capacity ▁to ▁promote ▁cou ps ▁has ▁significantly ▁decl ined . ▁Nor ▁has ▁the ▁United ▁States ▁been ▁not ably ▁successful ▁in ▁protect ing ▁its ▁al lies ▁against ▁cou ps , ▁though ▁it ▁has ▁been ▁better ▁at ▁d eter ring ▁right - wing ▁than ▁left - wing ▁ones . ▁The ▁Soviet ▁Union ▁has ▁only ▁been ▁able ▁to ▁f oment ▁cou ps ▁in ▁states ▁where ▁it ▁already ▁has ▁a ▁strong ▁presence , ▁but ▁has ▁been ▁extremely ▁effect ing ▁in ▁protect ing ▁its ▁al lies , ▁at ▁any ▁rate ▁against ▁anti - S ov iet ▁cou ps . ▁No ▁Third ▁World ▁state ▁with ▁a ▁Soviet - style ▁v angu ard ▁party ▁has ▁yet ▁been ▁over th rown ▁by ▁a ▁right - wing ▁coup , ▁though ▁states ▁with ▁reg imes ▁which ▁already ▁lean ▁towards ▁the ▁Soviet ▁Union ▁of ▁Marx ism – Len in ism ▁may ▁be ▁subject ▁to ▁coup ▁attempts ▁intended ▁to ▁put ▁a ▁move ▁reli ably ▁pro - S ov iet ▁regime ▁in ▁power . ▁ <0x09> ▁Work man like ▁rather ▁than ▁out standing , ▁this ▁study ▁also ▁exempl ifies ▁the ▁most ▁exclusive ▁concern ▁of ▁American ▁academ ics ▁with ▁subjects ▁of ▁interest ▁to ▁US ▁policy - m akers . ▁Three