Polish Prime Minister Donald Tusk says his country's parliament will vote to ratify the EU Reform Treaty at a special session this Tuesday. The compromise was made on Saturday and avoids the need for a national referendum which experts say could have delayed the Treaty's approval and weakened Warsaw's position in the EU.

Tusk made the deal with President Lech Kaczynski. It brings an end to the deadlock that started after the Conservative opposition, led by Kaczynski's twin brother Jaroslaw, threatened to block approval of the Treaty negotiated when their party was in power.

It is understood the compromise includes a parliamentary resolution recognising and protecting Warsaw's sovereignty in the face of EU legislation.

A two-thirds majority of deputies is required for ratification. Research suggests most Poles support the Treaty's implementation.