Donald Trump's return to the White House heralds a dramatic shift in East Asia's geopolitical landscape, with his second administration's "America First" agenda and transactional diplomacy poised to reshape traditional alliances and strategic partnerships. The region faces mounting security challenges, from escalating U.S.-China strategic rivalry to a strengthening North Korea-Russia alliance and wavering U.S. defense commitments in Asia. As geopolitical tensions expand beyond trade and technology into military and security domains, this session examines how East Asian nations can safeguard their interests and maintain regional stability, while assessing the broader implications of changing U.S. alliance policies and great power competition.