The news of Feltman's departure came before he heads to Ethiopia on Thursday to meet with senior government officials about the peace talks as part of Washington's latest push to bring an end to the conflict.
Approved by Senate, former Republican lawmaker replaces outgoing Ambassador David Satterfield.
US response to the massacre of 13 Turkish citizens by PKK in Iraq has been widely slammed by Ankara as conditional and a "joke" as authorities cracked down on suspects, arresting more than 700, including local heads of HDP party.
Turkish President Recep Tayyip Erdogan previously had said the S-400s would be activated in April but the coronavirus pandemic has focused Turkish efforts on combating the outbreak.
Shipment sent to the US includes 500,000 surgical masks, 40,000 overalls, 2,000 litres of disinfectant, 1,500 goggles, 400 N-95 masks and 500 face shields.
Speaking to the US ambassador, the Turkish deputy foreign minister voiced Turkey's strong criticism of the Senate resolution.
Turkish defence ministry condemns the House of Representatives for passing a resolution recognising the so-called "Armenian genocide" as well as a bill that seeks to impose sanctions on Turkey over its Operation Peace Spring in northern Syria
A seasoned diplomat, David Satterfield is taking the charge at a time when Washington-Ankara ties are no longer in harmony and conflicts in the Middle East have turned increasingly vicious.
David Satterfield has been the acting assistant secretary of state for Near Eastern Affairs since 2017 and has also previously served as the deputy US chief of mission in Iraq, ambassador to Lebanon.
US diplomat Frederic Hof had previously proposed a maritime demarcation line that would give Lebanon around two-thirds and Israel around one-third of a disputed triangular area of sea of around 860 square kilometres.
US Secretary of State also meets Syrian opposition negotiators during his visit to Jordan. Tillerson says he hopes to have talks about how to work cooperatively to lessen threats to Turkey when he visits Ankara this week.
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