WASHINGTON - China will lead talks among the five original nuclear-armed states to define arms control terms, the group said on Friday, a step that might ultimately bring greater clarity about its nuclear arsenal and strategy.

A working group of the United States, Russia, Britain, France and China is expected to launch talks this summer on a glossary of nuclear terms, an arcane but necessary step for wider talks on disarmament.

Of the five original nuclear-weapons states within the nuclear Non-Proliferation Treaty, China is the most secretive about its arsenal, its stockpile of fissile material and its nuclear doctrine, analysts say.

Under the treaty, which entered into force in 1970, the five committed to pursuing disarmament while the other signatories committed not to develop or acquire nuclear weapons.

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