Last year, Ecopetrol pulled out of a $3.6 billion deal to buy a stake in Texas shale-oil assets from the US company.--With assistance from Nicolle Yapur. (Adds share move starting in first paragraph.) ...

Colombia's President Gustavo Petro has instructed state-run oil company Ecopetrol to cancel its joint venture with the US-based Occidental Petroleum (Oxy) due to environmental concerns.

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