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Iran's Foreign Ministry says nothing else but the country's landmark 2015 nuclear deal with world powers will be discussed during high-stakes diplomacy meetings in Tehran this week.

Iranian state television quotes spokesman, Abbas Mousavi, as saying that visiting "European officials are not in a position to comment on Iran's issues beyond the nuclear deal."

The remarks came after German Foreign Minister Heiko Maas called Iran's ballistic missile program problematic during a visit Sunday to the United Arab Emirates.

Maas is now in Iran amid heightened tensions between Washington and Tehran. The tensions recently soared over America deploying an aircraft carrier and B-52 bombers to the Persian Gulf over a still-unexplained threat it perceives from Tehran.

After Maas, Japanese Prime Minister Shinzo Abe will arrive on Wednesday in Iran.