RAMBOUILLET, France (Reuters) - Rival Serbs and ethnic Albanians chewed over details of a Kosovo peace plan on Tuesday and diplomats stage-managing the talks prepared for a make-or-break weekend as a big power deadline neared for a deal. The six-na-tion Contact Group on Sunday set a deadline of mid-day this coming Saturday for the two sides to agree on a 60-page accord the group has drafted giving autonomy but not independence to Serbia`s mainly ethnic Albanian province of Kosovo. The United States has threatened the Serbs with air strikes if they torpedo an agreement. The ethnic Albanians face the choking off of their arms supplies and sources of funding if they are seen to be at fault. As the talks went into their 10th day, diplomats said the two sides had not agreed on any point, and had not even met, except when their leaders entered the same room on Sunday for a lecture by U.S. Secretary of State Madeleine Albright. The diplomats said that if any serious bargaining was to be done, it was likely to be in the final hours before the deadline set by the Contact Group - the United States, France, Britain, Germany, Italy and Russia. So far, the Serbs have kept up a defiant tone. The ethnic Albanians, who have much to gain from the peace plan and a lot to lose from rejecting it, have been reported more pliable. Western officials say key details of implementing the plan, including military and police arrangements and the peacekeeping force, are essentially a take-it-or-leave-it offer. Diplomats said the latest aspect of the plan to be formally put to the two sides involved economic reconstruction. Western countries have promised substantial funds for Kosovo if a peace deal works out.