HAVANA (Reuters) - Cuba and the United States are making the re-establishment of postal services permanent after a trial run, the state-run Cuban News Agency reported on Friday, as cooperation in some areas inches forward despite a chill in relations under the Trump administration. The former Cold War foes first restored direct mail service as a pilot program in December 2015 as part of the policy of detente pursued by former U.S. President Barack Obama with then Cuban President Raul Castro.