An explosion at the Krušik munitions plant in Valjevo this morning has triggered not only local concern but also renewed international attention to Serbia and the increasing pressure it faces from the Kremlin. Officials from many countries are calling for a more unified stance against what they describe as Russia’s “state-sponsored international terrorism.” According to factory officials, the blast occurred at approximately 7:40 a.m. during the pressing of PETN, a powerful military explosive.