U.S. President Donald Trump on Thursday launched what he called a "golden era" of energy policy seeking to assert power abroad through a boost in natural gas, coal and petroleum exports.

In a policy Trump calls "energy dominance," he rebranded efforts to export liquefied natural gas (LNG) to markets in Eastern Europe and Asia that had been set in motion during the previous administration.

The United States also will offer to export coal to Ukraine, where energy consumers have suffered from cuts in natural gas supply by Russia.