Speaking at a party rally in Khartoum, Omar al-Bashir, the Sudanese president, has called the government of South Sudan a movement of "insects".
Bashir's statement came as Sudan insisted it would reclaim the oil rich Heglig region after South Sudanese soldiers took over the oil field in the disputed territory along the two nations' border.
The leaders of South Sudan have vowed to fight to keep control of Heglig and the oil facility within it, which they say has always been part of their land.
Al Jazeera's Imran Khan reports.
Source: Al Jazeera