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.

In a major policy shift, the Biden administration has authorized Ukraine to use the ballistic missiles within Russia.

Russian President Vladimir Putin warned the United States and Ukraine’s other partners that the weapon could be deployed against their interests as well.

The stakes have never been higher in the Ukraine-Russia war. In the week that saw the conflict pass its 1000th day, Western powers substantially boosted Ukraine's military arsenal - and the Kremlin made its loudest threats yet of a nuclear strike.

President Joe Biden took a slew of measures this week to support Ukraine in its defense against Russia. While late, they could help make a difference.