The Security Council had tentatively scheduled a trip to Afghanistan in late October, but diplomats said it has been delayed partly because of security concerns.
The Afghan war began its 12th year on Sunday amid fears that once international combat forces leave in just over two years the country will again fracture along ethnic lines and there will be a repeat of the bloody ethnic fighting that followed the Soviet exit from Afghanistan in the 1990s.
The Security Council singled out continuing terrorist activities by the Taliban, al-Qaida and other extremist and armed groups and condemned their use of civilians as human shields. It expressed serious concern at the high number of civilian casualties, especially among women and children, noting that an increasingly large number are caused by the Taliban, al-Qaida and armed groups.
The council also stressed the link between terrorist activities and the illicit drug trade which still flourishes in Afghanistan.
The Security Council acknowledged that progress has been made in reforming Afghanistan's police and army, and it welcomed NATO's commitment to provide "sustained practical support aimed at improving and sustaining Afghanistan's capacity and capability to tackle continued threats to its security, stability and integrity" after international forces leave at the end of 2014.
The resolution adopted Tuesday extends the authorization of the NATO-led International Security Assistance Force until Oct. 13, 2013. The force currently includes about 68,000 Americans and about 40,000 troops from other nations.
The Security Council reiterated that the Afghan government's progress on improving security, governance, human rights, development and the rule of law is linked to its progress in combatting corruption and the narcotics trade, promoting accountability and ending impunity.