PRAGUE, Oct. 17 (Xinhua) -- Czech President Vaclav Klaus has expressed doubts that he would be able to block the EU's Lisbon Treaty from coming into force.

    "The train carrying the treaty is moving so fast and (has) reached so far that it can neither be stopped nor returned, though many people would like to do that," Klaus said in an interview published by daily newspaper Lidove noviny on Saturday.

    In the interview, Klaus mentioned a letter, in which British Conservative leader David Cameron assured the Czech leader that as soon as he wins elections he would try to block the treaty.

    "I cannot and will not wait for British elections," said Klaus. "Czech president reiterated his reservations about Lisbon Treaty. I do not consider the Lisbon Treaty to be a good thing for Europe, for the freedom of Europe, or for the Czech Republic."

    But Klaus admitted that the treaty's potential validation "will not be the end of history." "The dispute over freedom and democracy in Europe will certainly continue," he said.

    The Czech president still insists on guarantees by the EU, but says he had never demanded changes that would call for a new ratification in 26 other member countries.

    "I have never said that I would never be satisfied with similar guarantees that the EU gave to Ireland," he stressed in the interview.

    What he demands is a credible "promise" in a form of opt-out that would be attached to the next treaty which will have to be ratified by all 27 EU countries, said Klaus.