Venezuela has Russian S-300 and Pansir S1, (both of which have their own radar) as well as Chinese radar.

Are you certain he wasn't already secured by traitors in his midst before the US helicopters flew in?

CIA setting up outpost in Venezuela
http://www.rt.com/news/631607-cia-base-venezuela-ukraine

This doesn't happen unless the current leadership was in on it.

China’s YLC-8B Radar Transfer to Iran Could Rewrite Middle East Airpower and End Stealth Dominance

http://defencesecurityasia.com/en/china-ylc-8b-radar-iran-anti-stealth-middle-east-air-defense/

'The reported deployment of China’s long-range YLC-8B anti-stealth radar in Iran signals a strategic shift in Middle Eastern air defense architecture, directly challenging U.S. and Israeli reliance on fifth-generation stealth aircraft and reshaping regional deterrence dynamics.'

>>Emerging intelligence claims that China has delivered multiple YLC-8B radar systems—each capable of detecting targets out to 700 kilometres—signal a strategic recalibration in Middle Eastern air defense architecture that directly challenges longstanding assumptions underpinning U.S. and Israeli stealth-centric strike doctrines against Iranian territory.<<