Energy projects and the situation in Syria are expected to be the focus Monday when Russian President Vladimir Putin heads to Turkey to meet with his counterpart, Recep Tayyip Erdogan.
The two are meeting on the sidelines of the World Energy Congress, in Istanbul.
One focus will be the Akkuyu nuclear power plant, which Russian companies are building in Turkey. Another focus will be the Turkish Stream gas pipeline, which is expected to be laid under the Black Sea.
The two men are expected to sign an agreement that would lay the political groundwork for the pipeline, which Russia hopes to use to pump gas from Russia to south-eastern Europe.
Russia and Turkey have been rebuilding bilateral ties in recent months after their previously robust relations collapsed when a Turkish fighter jet shot down a Russian warplane on the Syrian border last year.
Indeed, talks about Syria - where Russia is supporting President Bashar al-Assad, whom Erdogan would like to see driven out of power - are expected to be the second main topic.
However, the two spoke by telephone last week and, according to the Kremlin, agreed that they must work together for a peaceful political process in Syria.