韩联社，韩国的新闻通讯社，则援引匿名的情报来源说，这架飞机看上去属于前苏联时期的军用喷气战斗机，其飞行员可能尝试叛逃。

Yonhap, the South Korean news agency, citing unnamed intelligence sources, said that the plane appeared to be a Soviet-era military jet and that the pilot might have been trying to defect.

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飞机战斗生存力已成为军用飞机设计的主要指标之一，飞机易损性研究的目的是揭示提高飞机战斗生存力的途径。

Aircraft combat survivability has become one of the main indexes in military aircraft design. The goal of studying aircraft vulnerability is to discover how to increase the aircraft survivability.

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