Actually Iran's presence is in a way much higher and more serious than US, Russia and China but it is of a different nature in comparison.
US presence in different places is either by force (invasion and genocide) or by colonizing, China's presence is always from the economy perspective (with investments, loans, etc), and Russia's presence is usually from resources and military presence to fight their battles abroad (like Wagner in Africa).

Iran's presence on the other hand is first and foremost revival of the ancient relations some of which dates back a thousand years. It is sometimes ideological bonds which Iran seeks to expand and solidify across the globe, sometimes it is just mutual interest like elimination of extremism and terrorism, to build infrastructure, etc. But in all cases it is kept out of the news for many reasons which would be off-topic here.

It is everywhere too. For example Iran has an active and large scale presence in USA background, ie. Latin America specially since Iran is a successful and kind of the leader of Anti-Imperialism in the world.
Same in Africa, as the successful case of Anti-Colonialism and Anti-Extremism and Anti-Terrorism there is a lot of mutual interests between Iran and Africa as a whole not to mention the decades of experience that Iran is relaying to them. This is why for the past couple of decades Iran has been helping many African nations deal with US backed terrorist organizations like Da'esh.
And of course in Asia from West which is where Iran is located itself and has the most dominance and allies to the East and South. For example one thing you won't find in the news is how Sri Lanka got rid of its decade long fight with insurgencies of the separatist militia with the help of Iran.