Attorney General Merrick Garland made an unannounced trip to Ukraine on Friday to join President Volodymyr Zelenskyy at a conference, according to a Justice Department official.

“The Attorney General held several meetings and reaffirmed our determination to hold Russia accountable for crimes committed in its unjust and unprovoked invasion against its sovereign neighbor,” the official said.

Garland traveled to Lviv, Ukraine, at the invitation of Zelenskyy to join him and international partners at the “United for Justice Conference.” The trip was not previously announced for security reasons, the official said.