Russian S-400 missile air defense systems are seen before the military parade to commemorate the 75th anniversary of the battle of Stalingrad in World War Two, in the city of Volgograd, on Feb. 2, 2018. Photo: Reuters / Tatyana Maleyeva.

Russia will begin delivering its advanced S-400 missile defense system to Turkey in 2019, the Interfax news agency cited Russia’s state arms exporter Rosoboronexport as saying on Tuesday.

The United States has expressed concern that NATO member Turkey’s planned deployment of the Russian-made S-400 could risk the security of several US-made weapons used by Turkey, including the F-35 jet.

Rosoboronexport also said it would switch to using local currencies in deals with foreign trade partners, instead of using the dollar, the RIA news agency reported.