Rupert Murdoch has taken to Twitter to criticise Chancellor George Osborne's decision to commit another £10 billion to the International Monetary Fund (IMF).
The 81-year-old media mogul wrote on the social networking site that the Government "must be mad" for agreeing to contribute additional funds, which critics say will used for more bailouts of the struggling eurozone.
His comments were followed by a series of tweets which mocked the coalition's education, energy and tax policies.
Mr Murdoch is arriving in Britain to give evidence to the Leveson Inquiry over two days next week.
In one tweet, he wrote: "Back in Britain. Govt sending IMF another ten bn to he euro. Must be mad. Not even US or China chipping in. Same time taxing hot food."
Mr Murdoch later wrote: "English spring countryside as beautiful as ever if and when sun appears! About to be wrecked by uneconomic ugly bird killing windmills. Mad."
On the subject of education in schools, he wrote: "Only one answer, really fix public education and give everyone equal opportunity. Present situation a crime against young."
Mr Murdoch is chief executive of global media giant News Corporation, which owns The Sun, The Times and The Sunday Times, and has a 39% stake in satellite broadcaster BSkyB.
He will face questioning on Wednesday and Thursday about practices at his British newspapers in the light of the phone-hacking scandal that led to the News of the World's closure. His son James, who stood down as News International executive chairman in February, will appear before the press standards inquiry on Tuesday.
Mr Murdoch is likely to be asked whether he was aware of allegations that the practice of illegally intercepting voicemails was not just confined to News of the World royal reporter Clive Goodman, who was jailed in 2007 for listening to royal aides' phone messages.