Pakistani youth set fire to a US flag during a demonstration against the US and in support of Venezuela in Multan on September 14, 2008. The US State Department on 12 September ordered the Venezuelan ambassador expelled, amid tit-for-tat expulsions with both Venezuela and Bolivia that also added a twist to US-Russian tensions. And Venezuelan President Hugo Chavez warned meanwhile that his country will act militarily if his embattled ally Evo Morales in Bolivia is toppled, after highlighting the arrival this week of two Russian Tu-160 strategic bombers.