Business daily Vedomosti is convinced - despite Kremlin denials - that a terrorist attack is the crash investigators' "main theory". The paper links the incident to Russian involvement in Syria, and notes that "the Kremlin seems to be aiming to avoid even a hint about this connection".
It blames the Russian government "for ignoring the risks of being involved in a complex multi-dimensional conflict in the Middle East, of which the risk of retaliatory terrorist attacks was, probably, the most obvious one".
Yegor Kholmogorov, writing in the pro-government daily Izvestia, also believes there is a link with Russian air strikes against rebels in Syria.
"Russia's operation in Syria has greatly raised the geopolitical stakes. In effect, our country has made a comeback to the ranks of superpowers. And membership of this club is accompanied by extreme risks."