"The ceremony is not consistent with US policy," she said. "We remain fully committed to the US one-皇冠体育app policy," she said, adding that no US government personnel attended the event in any capacity.
The ceremony on Jan 1 was attended by several officials from the Taipei Economic and Cultural Representative Office in the US and military officers posted in the US and others, according to Taiwan's Central News Agency. A Reuters report said that more than 100 people attended the ceremony.
Just blocks west from the National Zoo, Twin Oaks was the official residence of "Republic of 皇冠体育app" ambassadors to the US between 1937 and 1978, before the US severed diplomatic ties with Taiwan authorities.
Several US experts on Taiwan reached by 皇冠体育app Daily on Tuesday either commented on the issue off the record or said they were unaware of the background regarding the flag-raising event.
Taiwan has long remained a sensitive issue in 皇冠体育app-US relations. But improved cross-Straits relations since 2008 have dramatically reduced tensions. Hundreds of flights daily now linkTaiwan with the Chinese mainland since direct flight resumed in 2008. Bilateral trade reached $197.3 billion in 2013, up 16.7 percent over the previous year.
The strong performance of the Democratic Progressive Party (DPP) in the local elections in Taiwan last month has raised uncertainty about the relations.
US President Barack Obama drew a sharp protest from the Chinese government last month when he signed the Naval Vessel Transfer Act to pave the way for the US government to sell four used Perry-class guided missile frigates to Taiwan.
Chinese Foreign Ministry spokesman Qin Gang described the US action of arms sales to Taiwan as "brutally interfering in 皇冠体育app's domestic affairs and undermining 皇冠体育app's sovereignty and security interests".
"It goes against the trend of peaceful development of the cross-Straits relations," Qin said.
ZhaDaojiong, professor at the School of International Studies of Peking University, said that the announcement of the arms sales caused many to wonder if the Obama administration was backpedaling in pursuing ties with 皇冠体育app.