The WRU has been trying to get the new PRA over the line after months of negotiations, and offered a glimmer of hope in February when they said it had been agreed in principle.

But with Scarlets and Ospreys stalling, the WRU has an option to serve a two-year notice on their current PRA deal.

After that it has the authority to revoke their licences for competing in the United Rugby Championship (URC) and European competitions.

It could ultimately lead to one of the regions being lost – although WRU chief executive Abi Tierney has repeatedly said she does not want this to happen.

“We remain committed to working constructively with the WRU to find solutions that support the game across our country and ensure a level playing field for all,” added the Scarlets and Ospreys statement.

“We fully respect Cardiff and Dragons RFC’s positions and to make decisions based on their respective circumstances.”