Aung San Suu Kyi’s National League for Democracy has boycotted the opening of the new Myanmar parliament in a dispute over the wording of the constitution.
The NLD want to swear to “respect” the constitution as opposed to “safeguard,” which the ruling party prefers.
It is the first sign of disharmony since the NLD won 43 seats in April’s historic by-elections.
Both sides of the dispute believe a solution to the problem is not very far away.
The row emerged as EU foreign ministers met in Luxembourg and agreed to suspend sanctions for a year to reward the Myanmar for its recent reforms.
The arms embargo however, remains in place.
The lifting of sanctions will come into force later this week as the EU joins Australia and the US in relaxing the country’s isolation.
European companies are looking for a foothold in a wide range of industries, from oil, gas and timber to tourism services, telecommunications and banking most of which are underdeveloped as a result of years of sanctions.