Secretary of State Marco Rubio was visiting Guyana amid ExxonMobil’s oil production there. Venezuela has asserted claims to a large region of the country. Mr. Rubio later flew to Suriname.

US Secretary of State Marco Rubio warned Venezuela that any attempt to invade Guyana or threaten Exxon Mobil Corp.’s operations in the country would be a “very bad move.”

Venezuela, whose leftist leader Nicolas Maduro is despised by the Cuban-American Rubio, has increasingly pushed its claim to the disputed Essequibo region controlled by Guyana, and was accused earlier