Details are still being worked out about the timing of the meeting expected this week between President Trump and Russian President Vladimir Putin, according to a Putin aide.

Kremlin foreign policy aide Yuri Ushakov told reporters the meeting between Trump and Putin would occur on the sidelines of this week's Group of 20 summit in Germany.

"We will be looking for certain breaks, windows to hold this, the most important, meeting," Ushakov said, according to Reuters.

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"We have a lot of issues, which should be discussed at the highest level. ... That's why this meeting, this first personal contact, is so important."

Ushakov said he has heard the United States want to "raise the issues of terrorism and Syria."

"It seems to me that would be pretty reasonable," Ushakov said, when asked about what the two leaders would discuss during the meeting.

CNN reported Monday that Trump plans to talk with the Russian president about Syria and Ukraine.

Administration officials told CNN they don't expect Trump will bring up the Russian meddling in the 2016 presidential election during his meeting.