Pretty much on a global basis; third world countries excepted.
Government Ministers travel in Military VIP aircraft. It's the way business is done. It's is called showing the flag. Saving time, Security etc etc
Rarely except in the case of a Dictator is the Head of Sate aircraft anything more than a standard fit out; communications equipment excepted.
There is nothing flash about the RAAF Dassault Falcon 7X interiors. I had a peak inside the Queen's BAe146 when the aircraft was in Australia shortly before the Royal flight being disbanded. Spartan would be the word to describe the interior other than a few Crest's etc
Government's need VIP aircraft for Politicians and Military Chiefs. You will never hear the Government or Opposition arguing about the RAAF VIP fleet in Parliament as they are essential to conducting business. The flight hours are in the budget.