Polish FM Radek Sikorski on Ukraine crisis
30 April 2014 Last updated at 09:50 BST
Polish Foreign Minister Radek Sikorski, who has played a leading role in European diplomacy in the Ukraine crisis, has called for unity within the EU against Russian efforts to destabilise Ukraine.
The names of another 15 Russian officials were added to an EU sanctions list this week, but while some countries such as Poland, Britain and France are willing to take much tougher steps if necessary, other member states such as Italy, Greece and Cyprus are far more sceptical.
Mr Sikorski spoke to the BBC's Chris Morris in Warsaw.