evidence: The government of Venezuela accused neighboring Guyana Sunday of granting illegal oil exploration concessions in territory the two nations are disputing. Venezuela said it would reserve the right to take any diplomatic actions necessary. [...] The latest developments came hours after satellite images posted by the US Center for Strategic and International Studies (CSIS) showed Venezuela is extending its base on Ankoko Island, half of which Venezuela seized from Guyana in the mid-1960s, and nearby Punta Barima, less than 50 miles (80 kilometers) from the Guyana border. [...] Guyanese President Irfaan Ali is expected to meet his Venezuelan counterpart, Nicolás Maduro in March for a second summit on the border issue.