Taoiseach Micheál Martin has held discussions with Ursula von der Leyen amid deep unhappiness in the Irish government at the use of Article 16 -- seen as "completely unnecessary" with "explosive political implications" according to a government source https://www.irishtimes.com/news/health/eu-moves-to-halt-northern-ireland-being-used-as-vaccine-backdoor-to-britain-1.4471366

UK government spokesman says Michael Gove has been in touch with EU Commission's Maros Sefcovic and that the British government is now "carefully considering next steps".

Hours since its publication, the European Commission's vaccine export control regulation has been unpublished from its website

The regulation has come down, and urgent talks ongoing in the European Commission on how to fix it. I'd expect a new version by morning. Too late to stop reports that Article 16 "has been triggered" - a contested idea of what Art 16 is - and impression that Protocol is undermined

What a mess.

Uproar over this in member states is not confined to Ireland.
Very much fuelling exasperation with European Commission, at a time when capitals were already losing patience over vaccines.

Taoiseach Micheál Martin and PM Boris Johnson have had a "constructive discussion", according to Downing Street spox.
Johnson "said the EU must urgently clarify its intentions and what steps it plans to take to ensure its own commitments with regards to NI are fully honoured"

EU Commission is going to publish a clarification within minutes and a new version of their vaccine export control regulation in the morning, I understand.