The talks have shown some progress, with the two sides already discussing what the scope of a compromise would look like, according to one official who asked not to be identified because the process is private.
The plans, due to be unveiled on Wednesday, are meant to strengthen the European bloc's ability to ease the vaccine supply squeeze it has suffered at home, while exporting tens of millions of doses to the rest of the world. "If that's to continue, it's really important for Europeans to get their fair share of vaccines".
The EU's original vaccine export authorization mechanism, introduced in January, exempted about 90 countries, many of which were poorer nations.
The issues will be discussed by European Union leaders during a video conference on Thursday.
AstraZeneca reported Monday that its COVID-19 vaccine provided strong protection among adults of all ages in a long-anticipated USA study, a finding that some experts hoped would help rebuild public confidence in the shot around the world and move it a step closer to clearance in the U.S. Italy used the controls to stop the export of 250,000 doses of the Oxford/AstraZeneca drug to Australia at the beginning of March.
Under the EU's current vaccine controls, the Italian government and the European Commission have the power to refuse an export permit for vaccines if the company has an unmet contract with the EU but proposes to send them to a list of certain countries including Britain. The measures would remain discretionary with no automatic bans on any shipment, they stressed.
European Union officials have insisted that two AstraZeneca plants in Britain should also be part of the EU's vaccine deliveries.
European Commission President Ursula von der Leyen said the EU has approved the export of some 41 million vaccine doses to 33 countries in the last six weeks and believes that it stands at the forefront of global vaccine-sharing efforts. "It has also become clear that Europe is alone in this partnership approach", said Manfred Weber, the head of the powerful European People's party group in the European Parliament.
The EU is looking at focused measures so any tougher restrictions won't affect the Pfizer Inc. and Moderna Inc. vaccines, which have made up the bulk of the shots dispatched to the United Kingdom from Europe up to this point.
He later added: "Actually, I regret saying that" before asking MPs repeatedly to "forget I said that".
"We in this country don't believe in blockades of any kind of vaccines or vaccine materials", he said.
Johnson, earlier on Tuesday, told a Downing Street press conference that vaccine production was an "international operation, produced by collaboration between worldwide scientists". "It's not something this country would dream of engaging in".