But leaders remain deeply wary of Erdogan and there are major concerns over Ankara's recent moves to shut down an opposition party and its departure from a treaty on violence against women.
"One thing I would say is that we're on the side of openness. That's where we are. I don't want to see blockades of vaccines or medicines, I don't think that's the way forward either for us or any of our friends," Johnson said in a pooled interview for broadcasters.
He also denied a report that he said capitalism and greed gave Britain its success in vaccinating its population.
"Europe shouldn't be a sort of useful idiot in the battle against the virus," the French presidential adviser told reporters ahead of a virtual EU summit on Thursday.
The regulation is aimed at making vaccine trade reciprocal and proportional so that other vaccine-making countries sell to Europe and the EU does not export much more than it imports, one EU official said.
The pan-European STOXX 600 rose 0.2pc, reversing declines from earlier in the session, with automobile stocks rising for a fifth day in the past six sessions.
The lobby group said the worst hit trade route was to Ireland. In January 2020, Ireland was the UK's biggest market, representing around 18% of total food and drink exported. A year on the figure had dropped to only 5%.
Earlier this month several EU countries suspended its use, pending a review by the European Medicines Agency (EMA) after dozens of isolated cases of blood clots and brain haemorrhages.
However, that would coincide with French President Emmanuel Macron's campaign for re-election in a potentially tight race, in which a Mercosur deal could cost him support.
"It is important here that we ensure together with (European Commission President) Ursula von der Leyen and (European Council President) Charles Michel that there is a correction mechanism," Kurz told a news conference with his counterparts from Bulgaria, Slovenia and the Czech Republic.
Morales, for his part, demanded in a tweet that the "authors and accomplices" of what he denounced as a "coup d'etat" against him be "investigated and punished."