Defense Secretary Lloyd Austin over the weekend ordered more U.S. troops and military equipment sent to Europe as Russia presses its attack on Ukraine, a senior defense official said Monday.

Austin ordered roughly 500 additional troops to Poland, Romania and Germany “to respond to the current security environment in light of Russia’s renewed aggression against Ukraine” and to bolster NATO’s eastern flank, the official told reporters.

They stressed President Biden’s assertion that no American troops will be sent to Ukraine and that the additional forces are “enablers” going to NATO allies “to shore up capabilities that are already there.”