Former Finnish President Martti Ahtisaari, who won the Nobel Peace Prize for his work on conflict resolution, has died at the age of 86. Ahtisaari was known for brokering peace in Kosovo, Indonesia, and Northern Ireland. He believed that all conflicts could be settled and was a strong advocate for peace. Ahtisaari's global fame helped boost Finland's image internationally. He also supported Finland's EU membership and encouraged voters to support the accession referendum in 1994.