If its foreign policy were guided by respect for territorial integrity and sovereignty, Eritrea would not support Russia. Eritrea supported Russia because Isiaias' government is guided by the kick they get out of annoying Western diplomats and the short-termist "My enemy's Enemy is My Friend". Eritrea's foreign policy is not guided by long term national interests and solid principles. They don't care what precedent they are setting by supporting Russian irredentism and future effects on Ethiopian irredentism in regards Asab.
You cannot support Russian irredentism in Crimea and reject Ethiopian irredentism in Asab! The principle is the same. Eritrean Foreign minister was the first diplomat to visit to Crimea when the entire world opposed the annexation.
[irredentism (noun) a policy of advocating the restoration to a country of any territory formerly belonging to it.]
High-level Eritrean delegation headed by Foreign Minister Osman Saleh conducting visit in Crimea
On Jun 6, 2014
A high-level Eritrean delegation headed by Foreign Minister Osman Saleh and including Mr. Yemane Gebreab, Head of Political Affairs at the PFDJ, is conducting visit in the Republic of Crimea.
Asmara, 06 June 2014 – A high-level Eritrean delegation headed by Foreign Minister Osman Saleh and including Mr. Yemane Gebreab, Head of Political Affairs at the PFDJ, is conducting visit in the Republic of Crimea.
In a meeting it held with Vladmir Konstantonov, Chairperson of the Crimean Parliament, the high-level delegation indicated that the visit is aimed at taking observations regarding developments in the country it has been following through the media.

https://shabait.com/2014/06/06/high-lev ... in-crimea/
Ukraine Condemns Eritrea for visiting Crimea
Yesterday, Ukraine's Ministry of Foreign Affairs issued a press statement protesting the visit of senior Eritrean officials to Crimea which came at the invitation of the Russian Federation. The statement said:
MFA expresses its strong protest to Eritrean side over not approved by Ukraine visit on June 5-6, 2014 of Minister for Foreign Affairs of the State of Eritrea Osman Mohammed Saleh to the temporarily occupied by the Russian Federation the Autonomous Republic of Crimea.
Ukraine considers that visit as an unfriendly step, blatant disregard of international law by Eritrean side as well as a flagrant violation of Ukrainian sovereignty and domestic law, of the UN Charter and the UN General Assembly resolution "Territorial integrity of Ukraine" adopted on March 27, 2014, that may have deeply negative effect on further development of Ukrainian - Eritrean relations.
We call on the Eritrean side to respect strictly the territorial integrity and sovereignty of Ukraine and to comply with the international law.
http://www.madote.com/2014/06/ukraine-p ... a-for.html