Venezuela has longstanding border disputes with Colombia--most recently over the capture of a Colombian insurgent leader inside Venezuela--and Guyana, but seeks in general to resolve them peacefully. Bilateral commissions have been established by Venezuela and Colombia to address a range of pending issues, including resolution of the maritime boundary in the Gulf of Venezuela. Relations with Guyana are complicated by Venezuela's claim to roughly three-quarters of Guyana's territory. Since 1987, the two countries have held exchanges on the boundary under the "good offices" of the United Nations.