Saudi Arabia and Pakistan sign mutual defence pact as regional tensions escalate

Deal with nuclear-armed Pakistan comes as Gulf Arab states worry about US reliability while Saudi official says pact isn't responding to specific events'

Saudi Arabia and nuclear-armed Pakistan have signed a formal mutual defence pact in a move that significantly strengthens a decades-long security partnership amid heightened regional tensions.

The enhanced defence ties come as Gulf Arab states grow increasingly wary about the reliability of the US as their longstanding security guarantor - concerns heightened by Israel's attack in Qatar last week.