“The Turkish president’s visit… is planned for the end of the year,” Umit Yardim said.
In February, Yardim said the two heads of state will meet as part of the High-Level Russian-Turkish Cooperation Council (HLCC) and did not rule out Erdogan's visits to Russia within other frameworks.
Relations between Moscow and Ankara improved after plans to construct a new Turkish Stream pipeline were announced by Russian energy company Gazprom last December.
Set to replace the terminated South Stream project by late 2016, the Turkish Stream is estimated to have an annual capacity of 63 billion cubic meters, 14 billion of which will meet Turkey's gas needs.
The rest is planned to be distributed to southern European consumers from a gas hub on the Turkish-Greek border.
