Explanation:

The United States has recently imposed sanctions on Turkey over Ankara’s acquisition of Russian S-400 air defence systems.

• Ankara acquired the Russian S-400 ground-to-air defenses in mid-2019 and says they pose no threat to NATO allies.
• Washington has long been threatening sanctions on Turkey and had removed the country from an F-35 jet program last year.
• India got a waiver from buying the Russian S-400 air defence systems from the outgoing Trump administration.

S-400 Air Defence Missile System

• The S-400 Triumf, (NATO calls it SA-21 Growler), is a mobile, surface-to-air missile system (SAM) designed by Russia.
• It is the most dangerous operationally deployed modern long-range SAM (MLR SAM) in the world, considered much ahead of the US-developed Terminal High Altitude Area Defense system (THAAD).

Countering America’s Adversaries through Sanctions Act (CAATSA)

• It was passed unanimously by the US Congress and signed reluctantly by US President Donald Trump.
• Enacted on August 2, 2017, its core objective is to counter Iran, Russia and North Korea through punitive measures.
• Section 231 of the Act empowers the US President to impose at least five of the 12 listed sanctions — enumerated in Section 235 of the Act — on persons engaged in a “significant transaction” with Russian defence and intelligence sectors.

Hence only statement 1st is correct.