Paris  - While US President Barack Obama is very intelligent and charismatic, he is "not always at his best when it comes to decisions and efficiency", French President Nicolas Sarkozy was quoted Thursday as saying.

"He has only been elected for two months and has never managed a ministry in his life," Sarkozy was quoted as saying by Liberation newspaper. There were things on which Obama had no opinion, he added.

Sarkozy was quoted as saying that during the recent summit meetings in Europe he had told Obama, in reference to the European Union's climate agreement, that "I don't think you have quite understood what we (the EU) have done on the subject of CO2."

Sarkozy's remarks were reportedly made Wednesday to a meeting at the Elysee Palace at which the French president briefed a group of MPs on the results of the recent G20 summit.(dpa)