China remains the greatest security challenge for the United States despite Russia's war in Ukraine, and the threat from Beijing will determine how the US military is equipped and shaped for the future, according to a new Pentagon defense strategy. While the document released Thursday says that conflict with China ''is neither inevitable nor desirable,” it describes an effort to prevent Beijing's “dominance of key regions” — a clear reference to its aggressive military buildup in the South China Sea and increased pressure on the self-governing island of Taiwan. It warns that China is working to undermine American alliances in...