US President Joe Biden (C) is saluted by marines as he disembarks from Marine One ahead of walking to Air Force One at Munich Airport in Munich on June 28, 2022, after a G7 summit and enroute to Madrid for a NATO summit. (Photo: AFP)

US President Joe Biden on Wednesday announced US reinforcements of NATO forces in Europe, saying the alliance is needed more today "than it ever has been."

NATO will be "strengthened in all directions across every domain -- land, air and sea," he said at a summit of the transatlantic alliance being held in Madrid.