-The author is a geostrategic analyst and freelance columnist on international affairs. ISTANBUL  The Quad, a topflight summit of leaders involving the US, Japan, India, and Australia, is scheduled to be held in Delaware on Sept. 21 as a "farewell" for US President Joe Biden and Japanese Prime Minister Fumio Kishida before they step down from their respective offices. This meeting holds significant geopolitical weight, especially as China has been eyeing the Quad with suspicion as a possible