US President Joe Biden strongly backs Finland and Sweden's bid to join NATO in the face of Russia's invasion of Ukraine, as the Nordic nations' leaders promise to address concerns raised by Turkey. "The bottom line is simple. Quite straightforward: Finland and Sweden make NATO stronger," Biden says in an address at the White House, offering the "full, total, complete backing of the United States of America." TO COMPLETE VIDI32AH26M_EN AND VIDI32AG9LF_EN IMAGES AND SOUNDBITES