Kremlin critic Aleksei Navalny has been discharged from the Berlin hospital where he was being treated for what Germany has said is a case of poisoning with a nerve agent from the Soviet-era Novichok group.

“The patient’s condition had improved sufficiently for him to be discharged from acute inpatient care,” the Charite hospital said in a statement on September 23.

German authorities have said tests in Germany, France, and Sweden have determined Navalny was poisoned with a chemical agent from the Novichok group.

French President Emmanuel Macron on September 22 demanded a “swift and flawless” explanation from Moscow for the poisoning during his speech to the 75th-annual United Nations General Assembly.

Several other countries in the West have also demanded an explanation from Russia, but Moscow has declined to open an investigation so far, saying it has yet to see evidence of a crime.