Australian rugby officials have set a three-week deadline for New Zealand to accept their demands for a trans-Tasman Super Rugby competition, or they will walk away and set up a domestic tournament.
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Rugby Australia interim chief executive Ron Clarke said the issue had gained added urgency because talks with broadcasters over rights to the 2021 season were due to open early next month.
"We've put a deadline on broadcast submissions of September 4, that's three weeks away... so D-Day's coming," he told reporters Monday.
Clark had a blunt message for New Zealand administrators: "The clock is ticking on the whole Super Rugby model for 2021."
Tensions between Rugby Australia and New Zealand Rugby have been high since the Kiwis released a blueprint last month for a radical shake-up of the southern hemisphere competition in response to the coronavirus pandemic.
Aside from jettisoning South African teams and Argentina's Jaguares, it also had room for only between two and four of Australia's Super Rugby teams, which Rugby Australia deemed unacceptable.
Australia wants the inclusion of all five sides contesting Super Rugby AU, the domestic competition established after the Super Rugby season was suspended.
The situation has prompted sniping from both sides of the Tasman, with Rugby Australia chairperson Hamish McLennan describing the New Zealand-Australia relationship as "a bit master-servant" in favour of the Kiwis.
When New Zealand asked for expressions of interest from Australian sides for its competition, Rugby Australia officials reportedly described the demands as "expressions of insolence".
The New Zealanders have questioned Australian rugby's player depth and whether it deserves five sides, with All Blacks coach Ian Foster remarking "we're not a charity".
After a slow start compared to its New Zealand domestic counterpart, Clarke argued Super Rugby AU had hit its stride recent weeks, underlining the case for five teams.
"We're increasingly buoyed by the quality of the games we're starting to see in our competition," he said.
"We're seeing how much rising talent is coming through in our young players and how this competition is starting to engage fans."
Clarke said Rugby Australia preferred a trans-Tasman model but, if it could not get five teams, was confident in proceeding with a domestic competition.
He said an Australian competition could look at inviting teams from Japan or the Pacific island to join in future years.
New Zealand Rugby declined to comment.