Does Iran have any remaining obligations regarding UN Security Council resolution 2231 and testing ballistic missiles?

Question

In recent US government news, Iran allegedly test-fired a missile:

The Iranian regime has just test-fired a medium range ballistic missile that is capable of carrying multiple warheads. The missile has a range that allows it to strike parts of Europe and anywhere in the Middle East. This test violates UN Security Council resolution 2231 that bans Iran from undertaking “any activity related to ballistic missiles designed to be capable of delivering nuclear weapons, including launches using such ballistic missile technology . . .”
_{Michael R. Pompeo, Secretary of State, State.gov}

This confuses me: the US notably pulled out of the Iran deal (related questions: 1, 2, 3), which (as far as I understand) has the implications that Iran no longer has obligations not to develop nuclear weapons. Maybe I'm misunderstanding something.

Question: Does Iran have any remaining obligations regarding UN Security Council resolution 2231 and testing ballistic missiles?

Answer 1

Strictly speaking, no.

The text of the resolution is here. The relevant part is here :

Iran is called upon not to undertake any activity related to ballistic missiles designed to be capable of delivering nuclear weapons, including launches using such ballistic missile technology, until the date eight years after the JCPOA Adoption Day or until the date on which the IAEA submits a report confirming the Broader Conclusion, whichever is earlier.

Since the US effectively breached the provisions of the resolution, Iran is under no obligation to fulfill the aforementioned obligations. What complicates the situation even more is that all other countries, which were also under obligations by previous resolutions (mostly concerning arms sales), do not have them anymore.

As with some other cases when the US acted unilaterally (attack on Yugoslavia, invasion of Iraq, invasion of Afghanistan, actions in Syria, etc.), this created a major loophole in international law, allowing other countries to do the same. It is entirely clear that Russia, China and maybe even India will trade with Iran, and that Russia would certainly cooperate militarily with that country.