Russian President Vladimir Putin and Türkiye President Tayyip Erdogan agreed on Friday to boost cooperation in the transport, agriculture, finance and construction industries, they said in a joint statement after a four-hour meeting.

Türkiye mediated a deal signed by Ukraine, Russia and the United Nations in Istanbul last month under which grain exports from Ukraine's Black Sea ports resumed after months of being blocked. 

In the statement, Putin and Erdogan stressed the need for "the full implementation of the Istanbul agreement, including the unimpeded export of Russia's grain, fertilizer and raw materials for their production."

The two leaders also agreed to switch part of the payments for Russian gas to rubles, Russian Deputy Prime Minister Alexander Novak told reporters after the talks.

"This is a really new stage; new opportunities, including for further development of our financial relations," Novak said, Russia Today (RT) reported on Friday.

Putin said that Russia supplies all types of energy resources, including oil, gas and coal to Türkiye in a stable and predictable manner and "without any interruptions", according to RT.

He said trade volumes between the two countries grew by 57 percent in 2021 and doubled in the first five months of this year.

(Sources: Reuters with edits)