Russia and Turkey will sign more than 20 agreements, including energy deals, during President Dmitry Medvedev's visit to Ankara this week, his top foreign policy aide said in comments released Monday.

"Some 25 agreements will be signed," the Kremlin's top foreign policy adviser Sergei Prikhodko said.

Medvedev will travel to
Turkey on a two-day visit Tuesday, on a trip that will also see him making a landmark visit to neighboring Syria earlier this week.

In
Ankara , Russia and Turkey will sign a co-operation memorandum to build and service a nuclear power station, Prikhodko said, without providing further details.

Russia has long looked to build Turkey 's first nuclear power plant but a Turkish court last year scrapped a tender won by a Russian-led consortium to build the plant. A consortium led by Atomstroiexport , Russia 's state nuclear giant, had been the only bidder in the tender to build four nuclear reactors with a total capacity of 4,800-megawatts at Akkuyu, in the Mediterranean province of Mersin .

Agreements to be signed by gas giant OAO Gazprom (GAZP.RS) and state oil firm Rosneft (ROSN.RS) will be among the "most commercially significant" deals to be signed, Prikhodko said.

Russia is Turkey 's main gas supplier and wants to build a section of its key South Stream pipeline through Turkey 's portion of the Black Sea to create a new route for Russian gas to Europe that will bypass Ukraine .

Turkey , which supports the rival European Union-backed Nabucco pipeline, has agreed to allow Moscow to start surveys in its territorial waters in the Black Sea for South Stream.

Writing in an article for the Turkish daily Zaman, Medvedev praised intensifying ties between the two countries.

"We can confidently say that Russian-Turkish ties are approaching the level of a full-fledged strategic partnership," he said in comments released for publication Monday.

The main event of the Russian-Turkish summit will be the first meeting of a new council for higher co-operation headed by Medvedev and Turkish Prime Minister Recep Tayyip Erdogan, the Kremlin said.