The EU has warned of tightening rules on exports of Covid vaccines, amid a row with AstraZeneca over a cut in planned supplies to the 27-member bloc.
The row could also affect supplies to the UK of the Pfizer-BioNTech vaccine developed by the US and Germany.
Health Commissioner Stella Kyriakides says the EU will take any action required to protect its citizens.
Last week, AstraZeneca told the EU it was falling behind on its supply target because of production problems. The EU has been criticized for the slow rollout of the vaccines, which it buys on behalf of all member states.