Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In June 2006, talks concerning a territorial dispute over the Bakassi peninsula were resolved. The talks involved President Paul Biya of Cameroon, then President Olusegun Obasanjo of Nigeria and then UN Secretary General Kofi Annan, and resulted in Cameroonian control of the oil-rich peninsula. The northern portion of the territory was formally handed over to the Cameroonian government in August 2006, and the remainder of the peninsula was left to Cameroon 2 years later, in 2008. The boundary change was met with a local insurgency, as some Bakassians preferred to remain Nigerian. Most militants laid down their arms in November 2009.In February 2008, Cameroon experienced its worst violence in 15 years when a transport union strike in Douala escalated into violent protests in 31 municipal areas.In May 2014, in the wake of the Chibok schoolgirl kidnapping, presidents Paul Biya of Cameroon and Idriss Déby of Chad announced they are waging war on Boko Haram, and deployed troops to the Nigerian border.Since November 2016, protesters from the predominantly English-speaking Northwest and Southwest regions of the country have been campaigning for continued use of the English language in schools and courts. People were killed and hundreds jailed as a result of these protests. In 2017, Biya's government blocked the regions' access to the Internet for three months. In September, separatists started a guerilla war for the indendence of the Anglophone region as the Federal Republic of Ambazonia. The government responded with a military offensive, and the insurgency spread across the Northwest and Southwest regions. As of 2019, fighting between separatist guerillas and government forces continues. The conflict indirectly led to an upsurge in Boko Haram activities, as the Cameroonian military largely withdrew from the north to focus on fighting the Ambazonian separatists.
What were the full names of the people who were involved in the talks concerning a territorial dispute over the Bakassi peninsula?