Helmut Marko has admitted that Red Bull's internal investigations have generated no evidence against Aston Martin in their 'copying' dispute.
Aston Martin drew the wrath of Red Bull at the Spanish Grand Prix by bringing a heavily-updated car which had a strikingly similar design to Red Bull's RB18.
The FIA cleared Aston Martin of any wrongdoing, but Red Bull confirmed that they would be investigating internally to find any data breaches.
Speaking to Formel1.de after the Monaco Grand Prix, Red Bull's Motorsport Advisor confirmed that ongoing enquiries mean that no further action is being taken at this time.
"There was data downloaded, but I never said where that data went," Marko clarified.
"That's another factor. Until we can prove something, we will not do anything against Aston Martin.
"At the moment we can't prove anything and so we're not making a case out of it, also because Aston Martin is not a direct competitor either."
Viewed by others:
Red Bull seeking clarification from FIA
Whilst replicating a rival team's design isn't a new thing in Formula 1, Red Bull are seeking calcification on where the regulation boundaries are.
Marko believed that it was understandable for Red Bull to want clarity on the regulations, and cited Ferrari's Monaco GP protests as an example of wanting clearer-defined rules.
"We do want clarification from the FIA," said Marko. "If you take Ferrari's argument [when they double protested against Red Bull after the Monaco GP], we are [also] talking about clarity on the rules.
"How far can you go? After all, we have a junior team AlphaTauri. If you interpret this case consistently, then AlphaTauri could also work more closely with us.
"It's all difficult to understand. If you look at the whole timeline, there are even more inconsistencies. But if you can't prove it in black and white, then you have to let it go. Since it's not a direct competitor of ours, we're not completely on top of it either.
"In short, at the moment there is no evidence that Aston Martin has actually copied us, except that the two cars are very clearly similar."
F1 Podcast: Was F1's cautious start to Monaco an insult to the drivers' abilities?
RacingNews365.com F1 journalists Dieter Rencken and Michael Butterworth discuss the Monaco Grand Prix, and reflect on whether decisions made by the Race Director were overly cautious.