侵犯领空并不成为击落的理由。这种事虽然没有什么法律规定，
但还是有一定的norm的。大家都不是国际政治军事专家，说话
最好有点依据。就这次事件而言，除了北约国政府出于盟国
的原因必须表态支持外，你能找出一个主流媒体认为土国的反应
是适当的吗？
这里有一篇the guardian的文章你好好学一下：
http://www.theguardian.com/world/2015/nov/26/russia-turkey-jet-mark-galeotti注意“usual practice”
Moscow may have been foolish to let its planes stray so close to the border – doubly so if its rules of engagement allowed pilots to dip into Turkish airspace when it was operationally useful (as is likely). But Turkey’s response went way beyond the usual practice.
尤其这段，土国自己的飞机侵入叙利亚被打下来时，土国总统和
北约秘书长是咋说的：
In 2012, the Syrians shot down a Turkish jet which had entered its airspace, and Erdogan’s furious response at the time was that “a short-term border violation can never be a pretext for an attack”.
(At the time, Nato secretary general Anders Fogh Rasmussen called it “another example of the Syrian authorities’ disregard for international norms”. There hasn’t been a similar critique of Ankara.)