[filoleg]

Two things:

One, medical masks don't seem to fall under the sanctions (according to the quick wikipedia article skimming I just did [0]), especially since they were donated, so it seems perfectly fine and legal.

Two, according to the same article, EU also has sanctions against Iran (with some differences from sanctions imposed by the US), so it is unfair to say that the US is the sole country posing those sanctions.

0. https://en.wikipedia.org/wiki/United_States_sanctions_agains...

[Udik]

> EU also has sanctions against Iran

Not sure exactly which (though I guess there are). Nonetheless, after the JCPOA was signed, EU companies had restarted doing business worth billions with Iran. So the current complete freeze of EU commercial exchanges whit Iran in entirely due to the threat of sanctions from the US (that is, sanctions against EU companies, not against Iran).

[filoleg]

There is a wikipedia article regarding EU sanctions on Iran [0].

There is also another list of resolutions imposed by UN on Iran, with some of them being sanctions as well [1]. UN Security Council resolution #1929 specifically seems to be very relevant:

>[...] prohibit the opening of Iranian banks on their territory and prevent Iranian banks from entering into relationship with their banks if it might contribute to the nuclear program, and prevent financial institutions operating in their territory from opening offices and accounts in Iran. The resolution passed by a vote of 12–2, with Turkey and Brazil voting against and Lebanon abstaining. A number of countries imposed measures to implement and extend these sanctions, including the United States, the European Union, Australia, Canada, Japan, Norway, South Korea, and Russia.

0.https://en.wikipedia.org/wiki/Iran%E2%80%93European_Union_re...

1. https://en.wikipedia.org/wiki/List_of_United_Nations_resolut...

[Udik]

The EU sanctions listed in the wikipedia article are quite old, as the JCPOA came in force in 2016. As for the UN resolution, it's strange that you quote UN resolution 1929 from 2010, when resolution 2231 from 2015 is summarised as "lifted all previous sanctions on Iran provided that Iran remains in compliance with its responsibilities in the nuclear deal". Which Iran has (at least until very recently and anyway well after the US had reneged on the agreement and the EU had shown to be unwilling or unable to stick to it- because of US sanctions on EU companies).