The United Kingdom as we know it is dead, Wales's First Minister Carwyn Jones has said.
The Welsh Labour leader launched a stinging attack on Prime Minister David Cameron - accusing the Tory leader of almost "sleepwalking" the country into disaster over the way his government handled the Scottish referendum.
Mr Jones, who two years ago called for a constitutional convention featuring all four home nations, said the devolved governments must sit down together with the UK government for talks as soon possible.
The First Minister said: "We cannot escape from the fact that the prime minister almost sleepwalked us into disaster last night.
"Discussions now need to be had for a constitutional future of the UK.
"The old Union we know is dead. We need to forge a new one, but no more committees, no more messing about, no more panicky deals, it's time to sit together, all of us as four nations, and work this through."
The impact of the Scottish referendum has been hotly debated in Wales.
In the run-up to the vote, Westminster leaders said they would expand the Scottish Parliament's powers.
With that option on the cards, Assembly politicians said Wales should not be left out.
Earlier this year, Wales was given the power to borrow for large infrastructure projects but Mr Jones still wants additional powers.
Plaid Cymru leader Leanne Wood, whose party backed the Yes campaign, said the status quo could not remain.
"Wales can no longer be a spectator in its own national journey," she said.
"The Westminster parties made specific vows during the referendum campaign and in Wales the London parties have suggested a change of pace in terms of decentralising power to the people of Wales."
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