A top South Sudan official said South Sudan 's president spoke to the United Nations Secretary-General Ban Ki-Moon over the phone earlier Wednesday about the severity of the escalating crisis between Sudan and South Sudan .

The South Sudanese minister of information, Barnaba Benjamin Marial, also said Ban would arrive in
Juba Friday, although this was later denied by the U.N. which said the secretary-general would be in Europe .

Sudanese and South Sudanese troops have engaged in border clashes this week, prompting the international community to fear that the two formerly united countries would return to war.

Marial said
South Sudan wouldn't be "dragged into a senseless war" with Sudan , though he added that Sudan hadn't communicated to the government an intention to declare war.

Relations between the two countries, which separated in July, have soured in recent months over disputed border territories and oil transit fees. In January,
South Sudan shut its roughly 350,000-barrels-a-day oil production after accusing Sudan of stealing its oil. Sudan denies the accusation.