Vice president of the internationally recognised Yemen's President, Abd-Rabbu Mansour Hadi, called on the Yemeni troops, to join government forces against the Houthi rebels.

The vice president, Ali Mohsen al-Ahmar, made the appeal in a meeting, with commanders of government forces, in the liberated city of Marib, said a statement.

Still, large areas of Marib, the oil-rich province, east of the rebel-controlled capital Sanaa, are under Houthi rebel control.

The government forces are now stationing in the eastern part of Nehm district, about 50 km north-east of the rebel-controlled capital, in military preparation, backed by Saudi-led military coalition to storm Sanaa.

"We welcome the coming soldiers, who will join the legitimate government and call on others to join our forces against the Houthi rebels," the agency quoted al-Ahmar as saying.

Al-Ahmar's move came, two days after another military mobilisation call, made by government foe of former President, Ali Abdullah Saleh, who is the main ally with Shiite Houthi rebels.

Saleh urged the Yemeni army to join Houthi fighters, in border fighting against Saudi forces, the main ally of Hadi's government.

In his speech, Saleh also renewed his call to not conduct further peace talks with exiled President Hadi and his government, describing them as "mercenaries."

The move also signalled Yemen's further escalating military tension with neighbouring Saudi Arabia, which led a military coalition of mostly Arab countries, in support of exiled president Hadi, against the Houthi rebels.

The defence ministry has been under Houthi control since they seized the capital Sanaa in Sept, 2014.

However, the Yemeni national army has stayed neutral since then, and also remained neutral after the Houthis ousted internationally recognised President Hadi, and forced him along with his government into exile.

Both the government and the rebels' moves clearly indicate further military escalation, particularly after repeated rounds of peace talks, mediated by the United Nations, have failed.