Russian President Valdimir Putin and Iranian President Hassan Rouhani. Photo: Screenshot / PressTV.

Russia’s announcement on Monday that it will proceed with the sale of advanced missile systems to Iran crosses a so-called “red line” established by the Obama administration in 2010, according to comments by senior administration officials.

Following years of dissent from the United States, Russia announced on Monday that it would proceed with the sale of the advanced S-300 air defense missile system to Iran, which has been vying to purchase the hardware for years.

Read full story at the Washington Free Beacon.