The way Wikipedia describes Annapolis, Maryland

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Annapolis, the capital of the State of Maryland, is the city the Monterey Talks held.  The U.S. Naval College is there.  It is easy to speculate that the appearance of Chou Mei-wu, former Navy vice admiral now the director-general of the Coast Guard Administration, has some maritime issues to discuss with the College.
The point is: the Secretary-General of the NSC and the Minister of the MoFA both represent the President posse the authority to conclude agreements with a foreign state.  The presence of Sandra Oudkirk, the Director of ATI, Taipei, reveals the importance of this perspective.  There must be higher-rank officers on-site if there is an agreement or more.  That also shows the agreement must be something political.
It is not a guess without a cause. Wikipedia describes that the U.S. Congress at Annapolis, which temporary national capital of the United States in 1783–1784, ratified the Treaty of Paris of 1783, ending the American Revolutionary War, with Great Britain recognizing the independence of the United States. 

Annapolis, Maryland

Annapolis (/əˈnæpəlɪs/ (About this soundlisten) ə-NAP-ə-lis), the capital of the U.S. state of Maryland, also functions as the county seat of Anne Arundel County. Situated on the Chesapeake Bay at the mouth of the Severn River, 25 miles (40 km) south of Baltimore and about 30 miles (50 km) east of Washington, D.C., Annapolis forms part of the Baltimore–Washington metropolitan area. The 2010 census recorded its population as 38,394.

This city served as the seat of the Confederation Congress (former Second Continental Congress) and temporary national capital of the United States in 1783–1784. At that time, General George Washington came before the body convened in the new Maryland State House and resigned his commission as commander of the Continental Army. A month later, the Congress ratified the Treaty of Paris of 1783, ending the American Revolutionary War, with Great Britain recognizing the independence of the United States. The city and state capitol was also the site of the 1786 Annapolis Convention, which issued a call to the states to send delegates for the Constitutional Convention to be held the following year in Philadelphia. Over 220 years later, the Annapolis Peace Conference took place in 2007.