European Union leaders spelled out stark conditions for a new relationship with a departing Britain on Wednesday, warning that if British business wants to keep access to Europe’s single market, the country must accept European workers, too.

CCTV America’s Kate Parkinson reports.

The leaders produced no clear rehaul for their shaken union after an unusual and emotionally charged summit, but agreed they must make it more relevant to citizens and keep it from disintegrating after Britain’s unprecedented vote to leave. The 27 remaining presidents, chancellors and prime ministers said they’re “absolutely determined to remain united,” EU Council President Donald Tusk said.

They met without British Prime Minister David Cameron, who left Brussels on Tuesday night without any clear divorce plan, fending off pressure for a quick exit and punting the complex departure negotiations to his successor. In Britain, nominations opened Wednesday for a new Conservative leader to replace him after his devastating political miscalculation in calling last week’s referendum.

Other EU leaders warned the U.K. that if it wants to continue to enjoy the seamless single market after its departure, it would also have to accept that EU citizens can continue to enter Britain. That’s the crux of the current tensions: Britain’s “leave” vote hinged on concerns about migration from poorer EU countries.

The leaders emerged insisting that the “four freedoms” central to European unity are indivisible: the free movement of people, services, goods and finances.

They were focusing Wednesday on how to deal with the rest of the continent now that Britain is leaving. There’s a widespread sense that the post-war project to foster peace via trade has become a bureaucratic, undemocratic behemoth with little meaning for its 500 million citizens. The initial EU founding nations in the west lean toward a tighter, closer union, while newer nations in the east want to keep more control with national governments — notably of their borders.

“We all need to wake up and smell the coffee,” Lithuanian President Dalia Grybauskaite said.

To allow the status quo to continue, French President Francois Hollande warned, would benefit populist forces that seek “the end of Europe.”

Other EU countries are now facing calls for referendums on quitting the bloc. Popular French far-right leader Marine Le Pen pressed unpopular Hollande in a weekend meeting for such a vote in France, but his government has rejected the idea.

Tusk convened a special EU summit on Sept. 16 in Slovakia’s capital to work out a plan forward to keep the EU united.

German Chancellor Angela Merkel said the lesson from Britain’s departure isn’t necessarily either deeper integration or returning more powers to national governments. She said Wednesday: “this is not about more or less Europe as a principle, but about achieving results better.” She said that combating youth unemployment, for example, could involve both scrapping EU directives and deepening European cooperation.

Hollande said one measure he wants considered in Bratislava is making it possible for all young people in the EU to have the option of studying or spending time in another member country of the bloc.

“The coming weeks will be decisive,” Hollande said. “Europe must show its solidity.”

However the 27 remaining EU members remain divided over how to deal with migration. Central European nations led by Hungary refuse to accept imposed EU refugee quotas, and countries further north have all tightened border controls in response to the arrival of more than 1 million migrants last year. Britain is more concerned about EU immigration, since its strong economy draws hundreds of thousands of workers from other EU nations.

The shock British vote has roiled markets and had an impact on Europe and beyond. It overshadowed all the discussions Wednesday in Brussels, because it will rob the EU of its richest financial market, biggest military power and a diplomatic giant.

It could also prompt an unraveling of the U.K.

Scotland’s First Minister Nicola Sturgeon met Wednesday in Brussels with European Parliament President Martin Schulz and is meeting later with the leader of the EU executive, Commission President Jean-Claude Juncker. Scottish voters overwhelmingly chose to remain in the European Union but were drowned out by English voters. Sturgeon has indicated there may be a new referendum on Scottish independence.

“It was a good opportunity for me to set out Scotland’s position and Scotland’s desire to remain within the European Union and to protect our relationship with the European Union,” Sturgeon said after meeting Schulz. She added: “I don’t underestimate the challenges that lie ahead for us seeking to find a path.”

Hollande insisted the EU will make no advance deal with Scotland.

“The negotiations will be conducted with the United Kingdom, not with a part of the United Kingdom,” the French president said.

Watching Britain’s turmoil, Luxembourg Prime Minister Xavier Bettel said, “With a disunited United Kingdom, we need a united Europe more than ever.”

In London, nominations opened Wednesday to replace Cameron as leader of the Conservative Party, with Work and Pensions Secretary Stephen Crabb the first official contender. Former London Mayor Boris Johnson and Home Secretary Theresa May are also expected to run.