The United States reopened its embassy in Kyiv on Wednesday after it closed for three months due to the Russian war on Ukraine, the State Department announced, and appointed Bridget Brink as ambassador to Ukraine.

"The Ukrainian people, with security assistance from us, defended their homeland in the face of the unjustified Russian invasion, and as a result the American flag was hoisted over the embassy again," Foreign Minister Anthony Blinken said in a statement.

"We proudly stand with the Ukrainians and continue to support the government and people of Ukraine at a time when they are defending their country in the face of the Kremlin's cruel war of aggression," he added.

Late on Wednesday, the US Senate unanimously approved the appointment of Bridget Brink as US ambassador to Ukraine.

The United States has not had an ambassador to Ukraine since 2019 when former President Donald Trump fired Ambassador Marie Yovanovitch from the post.

Yovanovitch later became a key witness in Congress's first impeachment trial over Trump's decision to suspend military aid to Ukraine.

The United States closed its embassy in Kyiv on February 14, 10 days before the entry of Russian forces across the border.

American diplomats continued to provide services from the city of Lviv (west), while sometimes they had to sleep in neighboring Poland due to security concerns.

The return to Kyiv comes after the Ukrainian forces succeeded in confronting the Russian attempts to control northern Ukraine and the capital, at a time when the war has become concentrated in the east and south of the country.

"As we take this historic step, we have taken additional measures to enhance the safety of our colleagues returning to Kyiv, and have strengthened our security procedures and protocols," Blinken said.