The United States said it had reopened its embassy in Kyiv late on Wednesday after it had shut for the day due to what it called the threat of a significant air attack, a day after Ukraine used American missiles to hit a target inside Russia.

The United States shut its embassy in Kyiv on Wednesday morning due to what it called the threat of a significant air attack, a day after Ukraine used American missiles to hit a target inside Russia in what Moscow described as an escalation in the war.

The escalated tensions in the Eastern European country come after Biden authorized Ukraine to use U.S.-supplied missiles against Russia for the first time.