This photo shows a serviceman's vest during combat drills of the Zakarpattia Region Territorial Defence Forces in western Ukraine.

President Joe Biden said Tuesday in a New York Times opinion piece that he would "provide the Ukrainians with more advanced rocket systems and munitions that will enable them to more precisely strike key targets on the battlefield in Ukraine."

The announcement was part of a piece that explained the Biden administration's goals in Ukraine: "[A] democratic, independent, sovereign and prosperous Ukraine with the means to deter and defend itself against further aggression."