U.S. troops arrive in Poland | Sean Gallup/Getty Images US tanks, soldiers arrive in Poland The move is the largest US military reinforcement of Europe in decades.

More than 3,000 American soldiers, along with tanks and armored vehicles, began arriving in Poland Thursday, the BBC reported.

The deployment – hailed as the largest U.S. military reinforcement of Europe since the Cold War — is part of U.S. President Barack Obama's attempts to reassure NATO allies in Eastern Europe, rattled by Russia. Troops will rotate every nine months.

The move comes a week before U.S. President-elect Donald Trump’s inauguration. Trump has previously signaled he would seek to reset relations with Moscow, and has expressed admiration of Russia's President Vladimir Putin.

The U.S. will also carry out military exercises in the Baltics.