Taliban to start 'spring offensive' in Afghanistan

The Taliban announced the start of their spring offensive on Tuesday, pledging to launch large-scale offensives against government strongholds backed by suicide and guerrilla attacks to drive Afghanistan's Western-backed government from power.

The announcement of the formal start of "Operation Omari," named after the late Taliban founder Mullah Mohammad Omar, comes just days after Secretary of State John Kerry visited Kabul and reaffirmed US support for the national unity government led by President Ashraf Ghani.

The Taliban vowed suicide and tactical attacks in the operation, as well as targeted murders of enemy commanders in urban centres.

"The present Operation will also employ all means at our disposal to bog the enemy down in a war of attrition that lowers the morale of the foreign invaders and their internal armed militias," it said.

In line with recent statements, it also said it would establish good governance in areas it controlled as well as avoiding civilian casualties and damage to infrastructure.

How far the announcement will lead to an immediate escalation in fighting, which caused 11,000 civilian casualties last year, remains unclear. However, NATO and Afghan officials have said they expect very tough combat in 2016.

Heavy fighting has continued for months across Afghanistan, from Kunduz, the northern city that fell briefly to the insurgents last year, to Helmand province bordering Pakistan in the south.

Understrength Afghan security forces, struggling with heavy casualties and high desertion rates and short of air power, transport and logistical support, have struggled in their first year fighting largely alone.

According to NATO commanders, the Taliban exerts control over only six percent of Afghanistan but up to a third of the country is at risk from the insurgents and government forces control no more than 70 percent of the country's territory.

US General John Nicholson, who took over as commander of international troops in Afghanistan last month, is conducting a strategic review, including plans to cut US troops in Afghanistan from 9,800 to 5,500 by the end of the year.

Unless the plan is changed, the reduction would mean the end of most of NATO's training and assistance operation, leaving the remaining US troops focusing on counter-terrorism operations against terrorist groups like DAESH.