London, February 23 (RHC)-- The U.S. National Security Agency has spied on United Nations Secretary General Ban Ki-moon's private meetings to save American oil companies, WikiLeaks new release says.

Ban was reportedly attending a meeting with German Chancellor Angela Merkel to discuss ways on how to tackle climate change, a subject that has become controversially debatable in recent years.  "Today, we showed that UN Secretary General Ban Ki-Moon's private meetings over how to save the planet from climate change were bugged by a country intent on protecting its largest oil companies," WikiLeaks editor Julian Assange said on Tuesday.

The disclosure also touched on NSA's bugging of meetings held between other world leaders, including Israel Prime Minister Netanyahu and Italian Prime Minister Berlusconi, in which Netanyahu implored Berlusconi to help him deal with President Barack Obama.

Some of the new documents are classified TOP-SECRET / COMINT-GAMMA and are the most highly classified documents ever published by a media outlet.