Washington DC [US], March 22 (ANI): The United States, the United Kingdom and Australia have welcomed the new agreement to build Australia’s SSN-AUKUS submarines and termed it a significant milestone in the endeavour of defence cooperation. The agreement has been signed between Australia’s ASC Pty Ltd and UK-based BAE Systems, with the former being selected as Australia’s nuclear-powered submarine sustainment partner, according to a trilateral statement by Australian Defence Minister Richard Marles, US Defence Secretary Lloyd Austin and UK Defence Grant Shapps. AUKUS is a trilateral security p…