Guyana’s president has denounced an incursion by an armed Venezuelan naval vessel in disputed waters and home to a mammoth offshore oil deposit being developed by ExxonMobil.

Guyana’s government said Saturday that a Venezuelan naval patrol ship entered its waters and approached a vessel contracted by Exxon Mobil (NYSE:XOM) in the Straboek block, according to media reports.

The Venezuelan patrol ship that entered Guyana’s waters Saturday and positioned itself near a vessel contracted by Exxon Mobil Corp. in the Stabroek oil block has departed the area, according to the Guyana Defence Force.

Guyanese President Irfaan Ali said on Saturday that a Venezuelan coast guard patrol entered Guyanese waters earlier in the day, approaching an output vessel in an offshore oil block. The neighboring countries are involved in a long-running dispute about which country controls the 160,

Guyana and Venezuela have seen heightened tensions over control of the disputed Essequibo territory, a sprawling region rich in natural resources

The South American neighbours are involved in a long-running dispute about which country owns the oil-rich Essequibo area Guyanese President Irfaan Ali said on Saturday that a Venezuelan naval vessel had entered his country's waters earlier in the day,