FILE - This is a file image of the daughter of former Russian Spy Sergei Skripal, Yulia Skripal taken from Yulia Skipal's Facebook account on Tuesday March 6, 2018. British health officials say the daughter of a Russian ex-spy has responded well to treatment and is no longer in critical condition after a nerve-agent attack, it was reported on Thursday, March 29, 2018. (Yulia Skripal/Facebook via AP, File)

FILE - This is a file image of the daughter of former Russian Spy Sergei Skripal, Yulia Skripal taken from Yulia Skipal's Facebook account on Tuesday March 6, 2018. British health officials say the daughter of a Russian ex-spy has responded well to treatment and is no longer in critical condition after a nerve-agent attack, it was reported on Thursday, March 29, 2018. (Yulia Skripal/Facebook via AP, File)

LONDON (AP) — The spy saga that set off international tumult last month took a positive turn Tuesday as Yulia Skripal was released from a British hospital more than a month after she and her father were poisoned with a military-grade nerve agent.

“This is not the end of her treatment, but marks a significant milestone,” Salisbury District Hospital medical director Christine Blanshard said after the 33-year-old Skripal was discharged and taken to a secure location.

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Blanshard would not provide details about Yulia Skripal’s condition for reasons of patient privacy. Sergei Skripal, 66, the apparent target of the March 4 attack, is recovering more slowly than his daughter but continues to improve, she said.

No date has been set for his discharge, the doctor said.

“Both patients have responded exceptionally well to the treatment we’ve been providing. But equally, both patients are at different stages in their recovery,” she said.

The father and daughter were found unconscious on a bench and remained in critical condition for several weeks. Their poisoning has revived Cold War tensions between Russia and the West.

The British government is likely to keep details about Yulia Skripal’s location secret, given the sensitivity of the case. It accuses Russia of carrying out the attack, which Moscow vehemently denies.

If she is well enough, she is likely to be extensively questioned by British security officials and police about her recollection of events leading up to her poisoning.

The Russian Embassy in London tweeted its congratulations to Yulia Skripal, but said pointedly that Russia needs “urgent proof” that “what is being done to her is done on her own free will.”

The embassy accused British authorities of “concealing important evidence and blocking an impartial and independent investigation” by isolating the woman.

It reaffirmed its request for consular access to her. She is a Russian citizen.

It is not clear where the Skripals will live if they recover enough to resume normal activities. British officials may feel Sergei Skripal would not be safe to live openly in England any longer.

Bob Ayers, a security analyst who used to work with the CIA, said it is possible the Skripals would be given new identities in Britain or the United States under a program like those used to protect witnesses in high-profile criminal trials.

They could also choose to live in the open under the assumption that Russia would not attack a second time, he said.

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“They may not want to go into hiding,” Ayers said. “Now that the assassination attempt has been uncovered, the odds are pretty good the Russians won’t take another run at them. They’ll be under surveillance, the cops will put cameras up, they’ll keep good track of the Skripals.”

He said he would not expect Yulia Skripal to return to Russia despite her Russian nationality.

In a later tweet, the Russian Embassy said any attempt to settle her in another country would be regarded as “abduction.”

British police say the lethal nerve agent Novichok was placed on the door handle of Sergei Skripal’s house in Salisbury, an English city 100 miles (160 kilometers) west of London.

The nerve agent also sickened Nick Bailey, a police detective who came to their aid. He was the first of the three to be released from the hospital.

Yulia Skripal arrived in England from Moscow the day before the attack to spend Easter with her father

Sergei Skripal is a former Russian military intelligence officer who was convicted in Russia of spying for Britain.

He was imprisoned in Russia and eventually settled in England after a 2010 “spy swap.”

He was living under his own name in Salisbury, apparently believing he would be safe because there was no known history of Russia attacking former spies who had been part of exchanges.

The British government maintains the Skripals were poisoned by a military-grade nerve agent that could only have been made in Russia. Russia has denied the allegation.

The incident has led to a mass expulsion of Russian diplomats from countries aligned with Britain. Russia in turn retaliated by expelling diplomats from countries that sided with Britain.

There are still many unanswered questions about the brazen attack.

If Britain is correct that the Russian government is to blame, it is not clear why Sergei Skripal was poisoned now, some eight years after his swap.

Some analysts believe Russian President Vladimir Putin wanted to send a message to others who had betrayed Russia that they are not safe anywhere in the world. Others believe Sergei Skripal might have been involved in some private business that made Russian officials uneasy.

British officials have also not revealed how the Novichok was brought into Britain.