TEHRAN, Iran -- Iran's foreign minister is urging the world powers to avoid "trouble-making" issues as expert-level talks continue over its nuclear program.

Mohammad Javad Zarif made the comment in a joint news conference Sunday with his Italian counterpart Emma Bonino.

Zarif said: "All parties should avoid addressing issues that could be troublemaking." He did not elaborate.

Zarif expressed hope the talks will conclude "sooner or later." He said the current expert-level talks in Geneva are "slowly" moving forward.

In November, Iran agreed to cap its uranium enrichment in return for the West easing sanctions.

The West fears Iran is pursuing a nuclear weapon. Iran says its nuclear program is for peaceful purposes, like power generation and medical research.