Since the replacement of Russia by China as the primary would-be superpower rival to the U.S., Saudi Arabia has sought to balance its relationships with Beijing and Washington -- sometimes leaning more one way, and sometimes the other. Until the 2014-2016 Oil Price War, the U.S. was the core relationship; after the war had finished, it was China and Russia; and then, from the start of U.S. President Donald Trump’s second term in office, it was the U.S. again. However, in the aftermath of Operation Epic Fury against Iran, this looks set to…