Answer: Nothing.
Since 1992, the UN General Assembly has passed a non-binding resolution every year, except for 2020, condemning the ongoing impact of the embargo and declaring it in violation of the Charter of the United Nations and of international law. Israel is the only country that routinely joins the U.S. in voting against the resolution. Other countries that voted against the resolution in the past include Romania in 1992, Albania and Paraguay in 1993, Uzbekistan from 1995 to 1997, Marshall Islands from 2000 to 2007, Palau from 2004 to 2009 then once in 2012, and Brazil in 2019. 187 countries voted in favor of the resolution in 2024, with only the United States and Israel voting against it and Moldova abstaining.
If it is a violation for the Charter, then fucking do something you goddamn libs.