DHAKA: Ukraine has announced it is calling up military reservists, following Russia’s decision to allow deployment of troops.

Ukraine acting president Olexander Turchynov had already ordered increased security at key sites, including nuclear plants, reports the BBC.

US president Barack Obama has called the Russian decision a ‘violation of Ukrainian sovereignty’.

Ukraine has said it will seek the help of US and UK leaders in guaranteeing its security. Nato has called emergency talks to be held on Sunday at 1200 GMT.

BDST: 1603 HRS, MAR 02, 2014