The group, speaking following a meeting in Bonn, includes delegates from four continents, including United States, Japan, Great Britain, Germany, Switzerland and Australia.

They have criticised the IOC's failure to so far establish precise criteria as a "missed opportunity that has undermined the rights of clean athletes".

Suggested criteria of their own were then suggested, including the "full disclosure of all knowledge of doping activity" as well as "no association with prohibited coaches nor reference within the McLaren Reports [on Russian doping] or other forensic evidence".

Other criteria put forward include a minimum of 12 months testing in a World Anti-Doping Code compliant programme, unspecified "minimum" levels of out-of-competition testing and an application of biological passport and additional analysis.

It is also suggested that no athlete involved in pending cases must be considered.

All Russians competing at Pyeongchang 2018 must do so as part of a neutral "Olympic Athletes from Russia" team as part of a sanction for the "systemic manipulation" of doping samples at events including the 2014 Winter Olympic Games in Sochi.

A four-person IOC panel has been commissioned to determine Russian eligibility.

It will be chaired by France's Independent Testing Authority chair Valérie Fourneyron and also include IOC medical and scientific director Richard Budgett, World Anti-Doping Agency intelligence and investigations director Günter Younger, and Pedro Gonçalves, project manager of the Global Organisation of International Sport Federations' doping-free sports unit.

The IOC have claimed that they deliberately kept the decision making process flexible rather than produce a specific list of criteria.

"In its decision, the IOC EB deliberately did not limit this panel to a list of criteria to determine the invitation list," they said in a statement.

"The IOC entrusted this group to use all the available intelligence gathering, medical and scientific elements and the Pre-Games testing data. 

"As a result, the panel is conducting an in depth individual review of each case and is empowered to use its full discretion. 

"The IOC has full confidence in these internationally recognised experts and their procedure."

insidethegames understands, however, that the IOC now plan to reveal more details about the process tomorrow.

Other nations to sign-up to the NADO statement are Austria, Canada, Denmark, Estonia, Ireland, France, Finland, Netherlands, New Zealand, Norway, Singapore, Slovenia and Sweden.

A larger total of 28 NADOs last September called for Russia to be banned from Pyeongchang 2018. 

The latest message comes at a time where most sporting stakeholders are rallying behind the IOC position.

"The NADO leaders agreed in Bonn that robust and demanding criteria, as well as the names of Russian athletes with their individual testing histories who have met them, need to be published as soon as possible," the statement added.

"Published objective criteria serve the interests of clean athletes, and will help to restore confidence in the integrity of international sport which has been deeply damaged by the Russian doping scandal.

"NADO leaders urged the IOC to condition any future recognition of the Russian Olympic Committee upon fulfilment of WADA Roadmap. 

"This will involve compliance with at least two currently unfulfilled requirements: the findings of the McLaren Reports have not yet been acknowledged and WADA has not been given access to the stored samples and data at the Moscow laboratory. 

"If these conditions are not fulfilled it is clear to the NADO leaders that the suspension of the Russian Olympic Committee (ROC) should not be lifted. 

"Any sense that payment of a fine is sufficient for reinstatement of the ROC cannot be accepted.

"The protection of whistleblowers remains a matter of great concern and the NADO leaders called upon the IOC to provide more assistance in this regard by publicly calling for the whistleblowers protection and conditioning any ROC reinstatement on their ongoing safety."

The IOC are unlikely to accept these latter two points, though, as they have made it clearer that they hope to draw a line under the Russia situation and lift the ROC suspension after Pyeongchang 2018.

They have even said that the ban may be lifted in time for Russian athletes to march under their own flag at the Closing Ceremony.

A total of 42 Russian athletes disqualified from Sochi 2014 for doping and barred from all future Olympic Games are also appealing the IOC verdicts at the Court of Arbitration for Sport.

Thirty-nine of the cases are due to be heard next week.