security council report, page-2

The only violation committed by Eritrea is to adopt a self-reliance policy. It rejected US aid and hence its influence.

On the other hand, Ethiopia is the 5th largest recipient of aid from the US. Nigeria, the co-sponsored of the UN resolution, is the 3rd largest recipient of US aid. Source: http://www.madote.com/2011/01/eritrea-is-only-african-nation-to-cut.html.
Korea DPR has shown that sanctions do not work, and engagement is the best strategy.