President-elect Donald J. Trump’s pick for national security adviser, retired Lt. Gen. Michael T. Flynn, has been much more outspoken about militant Islamists than he has about China and North Korea, the two main strategic concerns of the United States in Asia.

That has left scholars and analysts looking for clues about his views on Asia. A book published in July for which he was a co-author, “The Field of Fight: How We Can Win the Global War Against Radical Islam and Its Allies,” offers some tea leaves. The half-dozen mentions of China and North Korea are couched in generalities, but there are glimpses into what the general thinks of the two nations.

General Flynn wrote that the United States needed to confront a global “alliance” between “radical Islamists” and the governments of China and North Korea, as well as Russia.

China and North Korea are officially secular Communist states, and China has blamed religious extremists for violence in Muslim areas of its Xinjiang region. In the book, General Flynn acknowledges that people may find the idea of an alliance between the Communist nations and jihadists to be strange, but asserts that it exists. He does not go into details on the alliance.