The Polish foreign minister has been filmed telling a Ukranian protest leader: "If you don't support this [deal] you'll have martial law, you'll have the army. You will all be dead."
When asked by ITV News Europe Editor James Mates if he had managed to convince the opposition, Radoslaw Sikorski appeared to reply: "I don't know."
The ministers later returned for further negotiations, after which they announced they had backing from the opposition.
This update has been edited to include video subtitles
More top news
Baronness Warsi has hit out at her own party's London mayoral campaign, suggesting it may destroy any prospect of winning.
After a chilly start to spring with April frosts rather than showers finally warmer weather is on its way.
President Obama's daughter Malia has accepted a university offer from Harvard, according to her parents.