By Oleg Shchedrov

MOSCOW (Reuters) - Russia is taking security measures as a precaution against the possibility tension over North Korea could escalate into nuclear war, news agencies quoted officials as saying on Wednesday.

Interfax quoted an unnamed security source as saying a stand-off triggered by Pyongyang's nuclear test on Monday could affect the security of Russia's far eastern regions, which border North Korea.

'The need has emerged for an appropriate package of precautionary measures,' the source said. ....