(Adds Topolanek quote, background)
PRAGUE, Feb 9 (Reuters) - Ratification of the EU's Lisbon treaty in the Czech Republic has been threatened by comments made by French President Nicolas Sarkozy, Czech Prime Minister Mirek Topolanek was quoted on Monday as saying.
Sarkozy angered the Czechs -- who hold the rotating European Union presidency -- last week by suggesting in an interview French car companies should locate plants at home rather than in countries like the Czech Republic.
"What Nicolas Sarkozy said is unbelievable," Topolanek said in an interview for daily Hospodarske Noviny.
"If somebody wanted to seriously threaten ratification of the Lisbon treaty, they couldn't have picked a better means or time," Topolanek said.
The Czechs have had a somewhat bumpy relationship with France, which held the EU presidency in the second half of the last year.
Sarkozy has continued to develop diplomatic initiatives during the Czech presidency.
When an interviewer suggested last week that the Czech Republic was not a visible or strong EU president, he merely said: "They are doing what they can."
The Czechs are the only EU nation that has not held a vote on the European Union's reform treaty, which is meant to streamline the bloc's decision-making after it grew to 27 members from 15 in the past five years.
No vote is yet scheduled, but although the Czech parliament is set to debate it in the lower house next week.
Topolanek has said he did not like the treaty but grudgingly backs it as a price worth paying for a membership in the EU.
He reiterated in the interview he would vote for the document, but he faces opposition from backbenchers in his own party, some of whom have said they would quit if Lisbon is approved. That would further weaken Topolanek's administration, which already lacks parliamentary majority.
Tooplanek's Civic Democrats have also linked approval of the document to the ratification of a separate plan to build a U.S. missile defence radar southwest of Prague.
The leftist opposition has criticised the radar plan, and given the equal balance of power between the government and opposition in parliament, both plans may be kept waiting in at least one chamber of the parliament for weeks or even months.
The treaty, which must be ratified by all 27 EU countries to take effect, would give the bloc a long-term president, a more powerful foreign representative, and change voting procedures to remove the need for unanimity in some cases.
It has been ratified so far by 24 of the member countries. Ireland rejected the treaty in a referendum but plans to hold a new vote later this year. The Polish parliament has approved the treaty but the president has yet to sign it. In Germany, the treaty has been approved but faces challenge in the constitutional court.
(Reporting by Jason Hovet, editing by Matthew Jones)