File photo of Russia's President Vladimir Putin and US President Donald Trump.

Russian President Vladimir Putin and US leader Donald Trump will discuss arms control and Iran and Syria crises on the sidelines of this week's G20 summit in Japan, the Kremlin said Wednesday.

Putin is also set to have talks with outgoing British Prime Minister Theresa May, Turkish President Recep Tayyip Erdogan and Saudi Crown Prince Mohammad bin Salman, foreign policy aide Yury Ushakov told journalists.

Putin and Trump will meet in Japan's western city of Osaka on Friday.

"As far as the subject of discussions is concerned, a lot depends on the leaders," Ushakov told reporters, adding that they are also likely to touch upon "strategic stability" and Ukraine.

The two leaders are also expected to discuss arms control including New START, a key nuclear weapons agreement that caps the number of nuclear warheads.

Putin said this month that Washington showed no genuine interest in conducting talks on extending the agreement and said Russia was prepared to drop the pact.

The Russian president will meet Britain's May after suggesting that it was time to "turn the page" on the countries' difficult relationship after the poisoning of a former Russian spy in the English city of Salisbury last year.

Putin and May previously met for formal talks on the sidelines of a G20 summit in China in 2016.

Putin and the Saudi Crown Prince will discuss the Russian leader's visit to the kingdom planned for October, while talks with Erdogan will focus on Russia's supplies of S-400 missiles that angered the United States.

Putin is also expected to meet with France's Emmanuel Macron and Germany's Angela Merkel and have a trilateral meeting with Chinese President Xi Jinping and India's Narendra Modi.