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Russia and China initiated their visa-free group tourist exchange on August 1 last year.
The 22-year-old man, now back in the safety of his family and home, said he had to lie still with dead bodies to escape the Ukrainian drones.
Regional authorities called for the mass evacuation of parts of Orenburg, a city of over half a million people about 1,200 km (750 miles) east of Moscow.
More than 4,000 people were evacuated in Orsk as swathes of the city of 230,000 were flooded.
The Games will take places amid a complex global backdrop, with Russia's war in Ukraine and Israel's conflict with Hamas in Gaza complicating efforts to safeguard the Olympics.
Reportedly, the agent who took the youths to Russia allegedly confiscated their passports and both suffered severe injuries after getting trapped in the war zone.
The disease is also referred to as 'Anomalous Health Incidents' (AHI) by the US.
Talking to Manorama News, David's father Muthappan revealed that he would reach home within two days.
According to reports, the Indian Embassy will issue temporary travel documents to the duo.
Ukraine strongly denied any connection and accused Putin of trying to shift the blame onto them.