Taiwan's Ambassador to the Marshall Islands denies gate-crashing an event between donors and Pacific Islands Forum countries last week in Majuro.
Taipei is contemplating its response after George Li was told to leave the conference centre, which is built by Taiwan, as the Post Forum dialogue began on Friday.
Taiwan was not officially invited to the session.
Earlier in the week, on China's request, Mr Li says Forum organisers had covered plaques proclaiming the conference centre as a gift from Taiwan.
Mr Li had gone to the building's lobby to ensure the plaques remained uncovered when he was told to leave by a Marshalls Foreign Affairs official.
"So we protest, naturally, saying that we were not in the conference room for the post-Forum dialogue, and we were just in the ICC (International Conference Centre) entrance hall in the building that symbolises the partnership and friendship between the ROC (Republic of China) and the RMI (Republic of the Marshall Islands).
Taiwan's Ambassador to the Marshall Islands, George T. K. Li