Tadić said that he was ready, authorised as per Vienna Convention, to sign the Stabilisation and Association Agreement (SAA) with the European Union if it were offered on 28 April, but not at the price of recognising Kosovo's unilaterally declared independence. Tadić attended the signing of the SAA ceremony in Luxembourg on 29 April, where the Deputy Prime Minister Božidar Đelić signed the document on behalf of Serbia, as per the authorisation of the Government from December 2007. He was opposed by the then Prime Minister Vojislav Koštunica who believed that Serbia ought not to sign "any" agreements with the European Union. While, on 1 May, Koštunica said that Russian Foreign Minister Sergei Lavrov was right when he said that the SAA should have been signed, he nonetheless vowed to annul the agreement after the parliamentary elections, calling it "not in the service of Serbia's territorial integrity."