Russia will continue deliveries of S-300 air defense systems to Iran through 2016, Vladimir Kozhin, Russian presidential aide on military-technical cooperation said Monday.

"Iran is fulfilling its obligations on advanced payments, while we are fulfilling our obligations on timely deliveries," Kozhin said.

The official added that the deliveries would take time and will most likely continue through 2016.

In 2007, Moscow signed a deal with Tehran to deliver five S-300 missile systems, but in 2010 Russia suspended the contract, due to a UN Security Council resolution that placed an arms embargo on Tehran.

In April 2015, Russian President Vladimir Putin lifted the S-300 delivery ban, after the P5+1 group, comprising the United States, the United Kingdom, Russia, France, China and Germany, signed an agreement with Tehran to remove economic sanctions in exchange for the peaceful nature of Iran’s nuclear program.