“Deeply concerned about reports that Turkey is exploring the possibility of further purchasing S-400 air defense systems from Russia.
Such deliveries will be another clear violation of US sanctions, ”RIA Novosti quotes him as saying.
Menendez stressed that the rejection of Russian military equipment could show Ankara's commitment to its "commitments within NATO."
In April, Turkish Foreign Minister Mevlut Cavusoglu said that the United States wants to settle the situation with Turkey after Ankara acquired the S-400.
In February, Turkish leader Recep Tayyip Erdogan called the supply of Russian S-400 air defense systems an internal affair of Turkey, which does not bear negative attitude towards NATO.