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GENEVA — Experts from scores of countries are meeting to discuss ways to define and deal with “killer robots” — futuristic weapons systems that could conduct war without human intervention.

The weeklong gathering that opened Monday is the second of its kind this year at U.N. offices in Geneva to focus on such lethal autonomous weapons systems and explore ways of possibly regulating them, among other issues.

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In theory, fully autonomous, computer-controlled weapons don’t exist yet, U.N. officials say. The debate is still in its infancy, and the experts have at times grappled with basic definitions. The United States has argued that it’s premature to establish a definition of such systems, much less regulate them.

Some top advocacy groups say governments and militaries should be prevented from developing such systems, which have sparked fears and led some critics to envisage harrowing scenarios about their use.