Washington: President Barack Obama's new Middle East envoy says there's "no such thing as a conflict that can't be ended."

And former Senate Majority leader George Mitchell is pledging his "full effort" to bring "peace and stability to the Middle East."

Mitchell says he will be facing a "volatile, complex and dangerous" conflict - one that has become so entrenched, it is seen by many as unchangeable. But he says Obama and Secretary of State Hillary Clinton are not convinced of that.

With Obama looking on, Clinton introduced Mitchell to a State Department audience Thursday, saying he would work to advance prospects for peace between Israel and its neighbours.

Mitchell says he saw during his work as an envoy in Northern Ireland that even a conflict that dates back hundreds of years can be resolved.