Do not travel to Belarus due to the volatile security environment caused by the Russian military presence along Belarus' border with Ukraine and military conflict. Russian forces are conducting military operations from Belarus, and this has heightened tensions in the region.
U.S. passports are valid for travel to Iran. However, the Iranian government does not recognize dual nationality and will treat U.S.-Iranian dual nationals solely as Iranian citizens.
Moscow is generally safe for solo female travellers. The city is well-policed and has a low crime rate, and the people are generally friendly and welcoming. However, it is always important to take the usual precautions when travelling alone, such as avoiding dark alleys and being aware of your surroundings.