AC Milan vice-president Adriano Galliani fired an angry broadside at Real Madrid on Wednesday for their attempts to lure Brazilian midfielder Kaka to Spain.
Venting his fury at Real president Ramon Calderon and sports director Predrag Mijatovic, Galliani told Spanish sports daily Marca: "For 50 years Real have been the greatest club in the world but now they have thrown all that out the window.
"This Real does nothing to honour its history or its name."
During his campaign to be president Calderon said he had a personal deal with Kaka and that he would bring him to the Bernabeu when elected. Calderon took office on July 3.
In June, Kaka signed a contract extension with Milan until 2011.
"Milan declares war on Real -- you can write it like that -- and it will do everything it can to make their life impossible," Galliani added.
"Kaka is not going to leave here, but if he did it would not be to Real. No one from this club will sit down and negotiate with them because what they are doing is not how great clubs work together.
"I want to clarify that these remarks are against the current Real [management] and not the club that we all know and love."
AC Milan have had their punishments reduced on appeal in Italy's match-fixing scandal and have been allowed to compete in the Champions League from the third qualifying round next season.
They will start their Serie A campaign with a points deduction of minus eight.