Yulia Skripal, daughter of Russian ex-spy Sergei Skripal, is in stable condition after being poisoned with nerve agent.
She and her father collapsed in Salisbury on March 4 after being exposed to military-grade Novichok.
Sergei Skripal remains in critical condition.
Yulia Skripal, the daughter of ex-spy Sergei Skripal, is "improving rapidly" after collapsing from nerve agent poisoning earlier this month.
She is now in stable condition, Salisbury NHS Foundation Trust said in a statement on Thursday. Her father, Sergei, remains in critical condition.
The Skripals were poisoned with the deadly, Russian-made Novichok nerve agent. They collapsed on a bench outside a shopping centre in Salisbury on March 4, and have been receiving care in Salisbury District Hospital ever since.
The attempted assassination on the two Russians has been the subject of a massive diplomatic dispute between Britain and Russia.
The UK, US, NATO, and more than 20 other countries have blamed Russia for the attack and expelled more than 149 Russian diplomats in retaliation over it. Russia, meanwhile, has repeatedly denied its involvement.
The Skripals' relatives and neighbours were reported to be losing hope earlier this week. UK Prime Minister Theresa May also warned that the Skripals "may never recover fully."
Sergeant Nick Bailey, one of the first responders on the scene of the attack, was released from hospital last week but said his life "will probably never be the same."
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Read Salisbury NHS Foundation Trust's full statement on the Skripals' condition:
"Following the incident in Salisbury on Sunday 4 March, three people have been treated as inpatients at Salisbury District Hospital. The hospital, via NHS England, has been providing regular updates on the condition of these patients, while respecting our duty of patient confidentiality.
"With only two patients now remaining in hospital, we are pleased to be able to inform you that Yulia Skripal is improving rapidly and is no longer in a critical condition. Her condition is now stable.
"Her father remains in a critical but stable condition."
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