The summit aims to mend ties at a time of high tension between Moscow and the West.
"The state of bilateral relations is very bad," said Ushakov. "We have to start to set them right." Rival roles in the Syrian and Ukrainian conflicts and other disputes have driven relations between Moscow and Washington to their lowest point since the Cold War.
"The aim of this meeting is to begin setting right the negative state of bilateral relations, to agree on concrete measures to improve them and to establish a more or less acceptable level of trust," Ushakov said.
"We would like these negotiations to contribute to the creation of an atmosphere that will allow us to talk about continuing contact, including possible visits to Moscow and Washington." He said the presidents would meet one on one with just their interpreters. They will then hold a working lunch with their full delegations.
"We are ready to address practically all questions relating to bilateral relations and the international agenda," Ushakov said.
"One of the main subjects of discussion will be the situation in Syria, notably in the context of the Iranian military presence in that country." He said the summit was scheduled to start at 1000 GMT and there was no time limit as far as the Russian side was concerned.
They are expected to discuss the expulsion of US diplomats from 2016 over issues including the allegations of election meddling.
The Kremlin said no joint summit statement was planned but the presidents would give a news conference after their meeting.
Moscow has repeatedly said it has never interfered in US elections. The United States is due to hold mid-term elections in November.
The last, brief meeting between Putin and Trump took place in November 2017 in Vietnam during an APEC summit.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)