WASHINGTON — Stopping short of a complete turnabout, President Donald Trump is expected to announce a revised Cuba policy aimed at stopping the flow of U.S. cash to the country’s military and security services while maintaining diplomatic relations and allowing U.S. airlines and cruise ships to continue service to the island.

In a speech Friday at a Miami theater associated with Cuban exiles, Trump will cast the policy moves as fulfillment of a promise he made during last year’s presidential campaign to reverse then-President Barack Obama’s diplomatic re-engagement with the island after decades of estrangement.

Senior White House officials who briefed reporters Thursday on the coming announcement said Obama’s overtures had enriched Cuba’s military while repression increased on the island. The officials spoke on condition of anonymity to discuss the policy before Trump announces it, despite the president’s regular criticism of the use of anonymous sources.

The moves to be announced by Trump are only a partial reversal of Obama’s policies, however.

More details about the changes are expected to be released Friday, when the new policy is set to take effect. But none of the changes will become effective until the Treasury Department issues new regulations, which could take months. That means that any U.S. traveler currently booked on a flight to Cuba in the next few weeks, or even months, could go ahead and make the trip.