Vaclav Klaus is entitled to his personal views on the Lisbon Treaty, but he is not entitled to lead the Czech Republic a dance.
The Czech Republic does not have presidential system, but is a parliamentary democracy. The parliament of the Republic has decided to endorse the Lisbon Treaty and it is merely the duty of the President to sign a treaty which has been lawfully approved in the country.
If Klaus feels so strongly about the issue, he should resign the presidency, not play rogue elephant and embarrass the Czech government, parliament and people. And – if he persists in his obstinacy – cause the constitutional crisis which would ensue from his removal or his being by-passed.