The message from the Polish foreign minister could hardly have been more direct: "Sign the deal or you will all be dead."
He was filmed addressing a protest leader and warning him that if the opposition did not sign up to a plan offered by Ukrainian President Viktor Yanukovych "you will all be dead".
Radoslaw Sikorski, one of three European foreign ministers who brokered yesterday's agreement to end the bloody standoff, was emerging from talks with opposition leaders when he issued the stark warning.
"If you don't support this [deal] you'll have martial law, the army. You will all be dead," he said in comments that were captured on film by ITV News.
When asked if he had managed to convince the opposition, the minister, clearly frustrated, muttered: "I don't know."
After a break in talks, the ministers returned to the negotiating table, and shortly afterwards announced that the opposition had agreed to sign the deal. "To my knowledge, interior ministry troops were being readied," he said according to the news channel.
The astonishing warning will disturb an international community which has been pressing hard for a deal to bring an end to the violence which left more than 70 protesters dead amid sniper attacks on Thursday.
While it is hoped that the agreement will stop Ukraine sliding into civil war, the suggestion that it has apparently been forced on the opposition under the threat of deadly force will be difficult to stomach.
The agreement, which calls for early presidential elections, the return of the 2004 constitution and the formation of a government of national unity, was the result of nearly 24 hours of non-stop shuttle diplomacy by the EU foreign ministers and a Russian government delegation. "Good compromise for Ukraine. Gives peace a chance. Opens the way to reform and to Europe. Poland and EU support it," Mr Sikorski posted on his Twitter page.
Tanaiste and Foreign Affairs Minister Eamon Gilmore welcomed the agreement reached in Kiev but warned a clear timeframe must be set for progress.
"I hope this will bring an end to the appalling scenes of violence that we have witnessed on the streets there this week," he said. Mr Yanukovych and the three opposition party leaders Arseny Yatsenyuk, Vitalty Klitchko, and Oleh Tyahnybok, finally signed at 4pm.
The deal grants several key demands that protesters have put forward in the past. Returning the 2004 constitution would strip Mr Yanukovych of many of the sweeping executive powers the presidency currently enjoys.
Mr Yatsenyuk, Mr Klitchko, and Mr Tyahnybok reportedly refused to sign until they had consulted with protesters, apparently worried that they would fail to sell the compromise to an increasingly hard-line crowd who want Mr Yanukovich's resignation.
It is far from clear that all protesters within the disparate alliance will abide by the deal, and Mr Sikorski's unsettling revelation could act as a call to arms for the more radical groups. Among protesters on Maidan Square, the attitude to Mr Yanukovych's offer of snap elections and return to the 2004 constitution is best summarised as one of indifference.
"There is no possible deal that would mean anything to us. There was a chance for compromise, and Yanukovych missed it," said one person who declined to be named.
Pravy Sektor, the right-wing paramilitary group whose fighters have played a prominent role in fighting since January, immediately rejected the elements of the deal announced by Mr Yanukovych. (© Daily Telegraph, London)