Russian President Vladimir Putin and his US counterpart Donald Trump are set to discuss a number of "very complex" issues, including the situation in Syria, the Kremlin said Friday.

"A rather detailed discussion on Syria is anticipated," Kremlin spokesperson Dmitry Peskov told a daily briefing.

He said "serious preparations" are being made for the summit slated for July 16 in Helsinki.

Peskov said Moscow is ready to follow the path of normalizing Russia-US relations to the extent Washington is ready to do.

On Thursday, the CNN quoted unnamed sources as saying that Trump believes he can strike a deal with Putin on a so-called exclusion zone in southwest Syria that will allow the United States to "get out ASAP."

Peskov said Moscow is unaware of Trump's plans.