Ankara, April 4: Russian President Vladimir Putin has said Russia and Turkey agreed to bring forward the delivery of the S-400 missile defence systems to Turkey. Speaking at a joint press conference on Tuesday with his Turkish counterpart Recep Tayyip Erdogan in Ankara, Putin said relations between the two countries are developing “step by step”, Xinhua news agency reported. Turkey struck a deal with Russia on the delivery of S-400 missile systems in September, three months before the two countries signed a loan agreement for the missiles purchase. “Relations with Turkey are constructive,” Putin said, noting that the two countries saw bigger trade volume in 2017. For his part, Erdogan welcomed Putin for his first foreign trip to Turkey after his re-election victory in March. “This is the best expression for the state of Turkey-Russia relations,” Erdogan said. Ankara and Moscow shared a common stance on Syrian issues and will continue fighting terrorism, he added.