The two states have been working for more than a year to finalize the deal, Hurriyet daily said in a report.

No details of the agreement were available, but Sergei Chemezov, head of the Russian state conglomerate Rostec, told the Kommersant daily on Wednesday Russia would supply Turkey with four batteries of S-400s under the deal.

He said Moscow was expected to begin the first deliveries in March 2020 and that Turkey was the first NATO member state to acquire the advanced S-400 missile system, Reuters reported.

Earlier on Friday, Turkish newspapers cited President Recep Tayyip Erdogan as saying Turkey would borrow in the Russian currency in a loan deal under the accord.

“We will not borrow in dollars in this loan, we will borrow in rubles,” Hurriyet daily quoted Erdogan as telling reporters on his plane, returning to Turkey from a trip to Africa.

According to Chemezov, Turkey would pay 45 percent of the cost of the agreement up front, with Russia providing loans to cover the remaining 55 percent.

Reporter’s code: 50101