Nippon Steel has condemned President Joe Biden's decision to block its proposed $15 billion acquisition of U.S. Steel, citing national security concerns over foreign ownership of a major American steelmaker. The company criticized the move as politically motivated, claiming it sacrifices the future of American steelworkers. Nippon Steel vowed to take legal action to protect its rights, warning that the decision sends a negative message to potential investors from allied countries. Japan's trade minister expressed regret over the decision, emphasizing that the acquisition would have benefited both countries' steel industries.