"The contract has been agreed upon. The issue on the loan has not been resolved yet," Kozhin was quoted as saying by Russian news agency RIA Novosti.
Kozhin said Russia saw "no obstacles" to the delivery of the air missile defense system to Turkey in connection with its membership to NATO.
The S-400 is Russia’s next-generation air defense system. It can carry three types of missiles capable of destroying targets including ballistic and cruise missiles.
It can track and engage up to 300 targets at the same time and has an altitude ceiling of 27 kilometers (17 miles).