evidence: The leaders of Venezuela and Guyana said Thursday that they would not use force against each other amid a dispute over an oil-rich piece of Guyanese land and agreed to create a joint commission to address the territorial spat. [...] Tension over the land, which amounts to about two-thirds of Guyanese national territory, has mounted in recent days after a Venezuelan referendum in which voters assented to the creation of a Venezuelan state within the disputed region. Guyana has called the move a step towards annexation and an "existential" threat. [...] Venezuela has long laid claim to the Essequibo and rejects an 1899 ruling by an international tribunal that set the boundaries.