A dearth of useful radar data in the search for missing Malaysia Airlines Flight 370 has exposed both the weaknesses of regional air-defense systems and also a deep-seated reluctance to share military information.

While Malaysia's air force has drawn ire for its failure to track Flight 370 effectively in the early hours of March 8, military and aviation analysts say that other Asian countries have similar deficiencies.

They also say that governments continue to view one another with suspicion in a part of the world characterized by historical tensions that make countries disinclined to share military data, even in a crisis. The mistrust includes nearby neighbors and China, which remains highly secretive.

The search for the flight stretched into its 10th day Monday, with more than 26 countries involved in the operation. Malaysia began the complex process of dividing the search, calling on Indonesian and Australian teams to lead efforts in much of the so-called southern corridor, a giant swath of the Indian Ocean that is believed to be one of two likely areas where the plane traveled after it deviated from its route. The other main corridor stretches north toward Kazakhstan and Turkmenistan and involves large areas of land mass.

On Monday, the U.S., in consultation with the Malaysian government, decided to pull the USS Kidd destroyer from the search effort. A defense official said P3 and P8 surveillance planes that will remain can search a far broader area of ocean than the destroyer and its two helicopters. "This isn't a degradation of our effort," said the defense official.