evidence: South Sudan has seized the town of Heglig, which is internationally recognised as Sudanese territory, though South Sudan disputes this. [...] The US condemned South Sudan's seizure of Heglig, saying it was "an act which goes beyond self-defence and has increased tensions between Sudan and South Sudan to dangerous levels". Sudan relies on the Heglig oilfields for a sizeable part of its budget, and has vowed to use "all legitimate means" to retake them, warning of "destruction" in South Sudan.