Bipartisan bill proposed by U.S. Senate to restrict F-35 aircraft transfer to Turkey

U.S. Senators on Thursday introduced a bipartisan bill to prohibit the transfer of F-35 fighter aircraft to Turkey until the U.S. government certifies that Ankara will not take delivery of a Russian S-400 air defense system, a statement on the move said.

"The prospect of Russia having access to U.S. aircraft and technology in a NATO country, Turkey, is a serious national and global security risk," said Democratic Senator Jeanne Shaheen, one of the four co-authors of the bill.

Turkey is a production partner in the trillion-dollar F-35 fighter jet program but Ankara also wants to purchase a Russian missile defense system, which the United States says would compromise the security of F-35 aircraft.