Japan and South Korea have begun translating U.S. investment pledges of up to $900 billion into projects after President Donald Trump capped tariffs on both countries at 15% last year. South Korea's $350 billion commitment includes $150 billion for shipbuilding and $200 billion for strategic investments, while Japan committed up to $550 billion in government-backed funding. Seoul outlined $142.3 billion in U.S. energy commitments, including $120 billion for eight large-scale nuclear reactors and $22.3 billion for a 6,472-megawatt natural-gas power facility in Encinal, Texas, led by Related Companies and NextEra Energy. The plant's first phase is slated to begin commercial operations in 2029. The nuclear program provides $100 billion for construction and $20 billion in contingency reserves, and its agreement was signed by both governments, Westinghouse Electric, Korea Electric Power Corp. and Korea Hydro & Nuclear Power. The Korean government said Thursday that it had not finalized an investment in the long-delayed Alaska liquefied natural gas project, following Trump's Oval Office announcement alongside Senator Dan Sullivan the previous day. President Lee Jae Myung and other South Korean officials said participation remains conditional on financial viability and legal compliance. Trump valued the proposed Alaska LNG development at $50 billion in a Truth Social post, while earlier White House figures cited $54 billion. Japan has announced two investment tranches totaling $109 billion, covering oil, gas, mineral, nuclear and gas-fired power projects. The commitments are subject to a Jan. 19, 2029 completion deadline, the end of Trump's presidential term. The governments also agreed to transfer a $10 billion advance payment by year-end for long-lead equipment under the Project Power nuclear framework.