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Russia hosted Iranian and Turkish presidents in Sochi; the three countries all have military forces in Syria.
The invitation comes amid news that India should receive delivery of S-400 defense missiles in October 2020.
The UN Security Council is scheduled to discuss the incident in a Monday session.
Trump had said he wanted to withdraw from the INF treaty because of alleged Russian violations.
More than 85,000 Islamist extremist fighters have been killed in the past three years, Moscow says.
India has come under pressure from the US to cancel the arms weapons purchases from Russia.
UN involvement in war-ravaged Syria should focus on infrastructure construction and restoration.
Although the Russian aircraft was shot down by Syrian defenses, Moscow has blamed Israel for the incident.
Putin had said that he wanted to sign a peace treaty "not now, but by the end of the year".
Thousands of Chinese troops and military hardware are participating in Vostok 2018.