Because Japan felt disrespected by the provisions of the Treaty of Portsmouth, it would most likely lead Japan to

The Treaty of Portsmouth ended the Russo-Japanese War, but Japan was unhappy that it received no war indemnity from Russia. Because the United States had mediated the treaty, many Japanese people felt the settlement favored Russia and lost trust in the United States as a negotiator. So the most likely result was distrust of the US and future negotiations with it.

AI-written and checked against the verified answer.