The material was published by senators James Inhof, Jack Reed, Bob Menendez, and Jim Rish.
"By the end of the year, Turkey will have either an upgraded F-35 fighter on its land, or the Russian air defense system S-400," the text says.
It is noted that "the choice made by Turkish President Recep Tayyip Erdogan will have serious consequences for his country's place in the world, its relations with the United States and its position in NATO."
"If President Erdogan does not make this choice and accepts the delivery of S-400, then sanctions will be imposed against Turkey in accordance with the requirements of US law," the article says.
Earlier, Erdogan said that the Russian proposal for the supply of Russian S-400 is more profitable than the US proposal for the Patriot system.
On April 3, the United States urged Turkey to choose between NATO and C-400 security.
At the same time, Ankara emphasized that the contract on the Russian systems is not subject to revision.