The US is not in a position to confirm reports of the use of chemical weapons in Ukraine, but is working to determine what occurred, US Secretary of State Antony Blinken said on April 13.<br /><br />Ukraine said earlier it was checking unverified information that Russia may have used chemical weapons while besieging the city of Mariupol<br /><br />“US isn't in position to confirm reports of use of chemical weapons in Ukraine but was working to determine what actually happened,” said US Secretary of State.