The European Union remains at loggerheads with AstraZeneca PLC after the Anglo-Swedish drugmaker refused to cave to demands that it take vaccine supplies from its U.K. factories to increase doses going to the bloc.

The root of the dispute is Astra¡¯s decision to prioritize the U.K. over the EU following a Belgian production glitch, in what Brussels claims to be a breach of contractual commitments. The two sides spoke Wednesday evening and held their ground with another meeting expected.

¡°We regret the continued lack of clarity on the delivery schedule and request a clear plan from AstraZeneca for the fast delivery of the quantity of vaccines that we reserved for the first quarter,¡± EU health chief Stella Kyriakides said after a virtual meeting with Astra¡¯s chief executive.