Ethiopia has threatened to topple Eritrea’s regime should the international community fail to enforce sanctions placed on the country in 2009.
Addis Ababa claims Eritrea is trying to destabilise the Horn of African nation by backing rebels, while also supporting Islamist militants in Somalia.
The Ethiopian government usually says it is content to keep security tight at home to deter attacks.
Eritrea fiercely denies the charges and accuses Western nations of siding with Ethiopia over the unresolved border row.
Eritrea, a tiny Red Sea state, broke away from Ethiopia in 1993 and has been under the leadership of President Isaias Afewerki, 67, since.