Sergei Skripal, who was poisoned in Salisbury, England last month with a nerve agent, is responding to treatment and is no longer in critical condition, the AP reports. It’s been a month since Skripal was poisoned along with his daughter, Yulia Skripal, who has been awake for over a week.

The backdrop: The U.K. along with France, Germany, and the U.S. blame Russia for the poisoning of Skirpal, and countries around the world have expelled Russian diplomats in retaliation.