ISLAMABAD: A high-level US Senate delegation met top foreign affairs official and military chief in Islamabad to discuss regional security as Washington gears up to send more troops to neighbouring Afghanistan.

The Sunday visit by members of the influential Senate Armed Services Committee, including top Republican John McCain, came days after Islamabad slammed Washington's decision to sanction a Kashmiri Separatist leader.

The relationship between the US and Pakistan has been strained at times with some in Washington believing Islamabad has not done enough to bring its influence to bear to persuade the Afghan Taliban to renounce violence.

McCain described US engagement with Pakistan in the region as "important" in his meeting with Foreign Affairs Adviser Sartaj Aziz, according to a foreign ministry statement.

Aziz for his part vowed Pakistan remained committed to "constructive engagement" with the US in the efforts to create a "stable and prosperous" Afghanistan.

He said Islamabad was ready to deepen its partnership with Washington in the fight against militancy, including against the expanding footprint of the Islamic State group in the region.

Pakistan Army chief General Qamar Javed Bajwa also called US cooperation a "key factor" in security, as McCain agreed on the importance of coordination between Pakistan and Afghanistan, a military statement said.