The woman is admitted to the Intensive Care Unit (ICU) in the burn wing of Delhi's Safdarjung Hospital. She was flown to Delhi yesterday evening in an air ambulance following a request from the Russian embassy and the Union government.
"She has 45 per cent chemical burns, with facial burns affecting both the eyes, neck, front part of the chest, abdomen, right arm, complete left leg and right thigh," a senior doctor at the hospital said, adding that she was critical but stable.
Patchy burn marks were recorded by the team on her back also.
Senior officials at Varanasi had yesterday said that the victim had dual citizenship of Russia and Bulgaria, and she was living with the accused as his friend, and not as a paying guest.
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The accused, identified as Siddharth Srivastava, fled to Allahabad after the incident and was arrested after he came to visit the victim at Sir Sunder Lal Hospital, where the victim was undergoing treatment till yesterday.
"Srivastav was unhappy over the decision of the woman to return to Russia. They had a quarrel over the issue after which Srivastav threw acid on her," Senior Superintendent of Police Akash Kulhary had said.
On the next day, Srivastav, who had fled to Allahabad after committing the crime, was nabbed when he came back to visit the victim in the hospital, Kulhary said.
A guilt-ridden Srivastav said at a press conference called by police, "I really feel shameful for my act, I don't know whether I would ever be able to meet her in my life."