Prague - Czech President Vaclav Klaus discussed Thursday his country's ratification of the European Union's reform treaty with Swedish Prime Minister Fredrik Reinfeldt, whose country chairs the EU until December 31, the presidential office said.

The president's spokesman Radim Ochvat said in a statement that the two leaders debated the matter by telephone "at (Reinfeldt's) request", providing no further details on the content of their conversation.

The office also said that Klaus is to meet Friday European Parliament President Jerzy Buzek, who is set to visit Prague as part of what is seen as an EU-wide diplomatic effort to ensure the pact's Czech ratification.

Klaus, a vocal opponent of the so-called Lisbon treaty and deeper European integration, may be the final person whose approval will be required for the accord to come to force.

The eurosceptic Czech leader, who is barred from signing the treaty pending a legal challenge, has been under increased pressure to ratify it promptly - if the country's Constitutional Court strikes down the complaint lodged recently by his followers.

After Ireland cleared the pact in a rerun referendum last week, it also awaits a presidential approval in Poland where officials have so far issued conflicting messages on that signature's timing.

Polish President Lech Kaczynski, however, is expected to ratify the accord in coming days.

The so-called Lisbon Treaty, which aims to raise EU's profile in the world arena through streamlining decision-making in the enlarged union, requires approval by all 27 members to become valid. The EU would like to see it to come to force on January 1.

As part of the EU's pro-Lisbon diplomatic drive, Swedish European Affairs Minister Cecilia Malmstroem met with several Czech officials in Prague on Thursday to map out prospects for the Czech ratification. (dpa)