In the space of just one year, Soviet policy in the Horn underwent a complete somersault. After the failure of the Marxist–Leninist confederation proposal in March 1977, Moscow made the critical decision that if a choice had to be made between Somalia and Ethiopia, it would opt for the latter. On 23 April 1977, the leader of the Dergue, Lt.-Col. Mengistu Haile Mariam, cleared the way for Moscow by expelling all US military advisers from Ethiopia and closing the Kagnew Communications Station and other US facilities in the country. Two weeks later, the new Soviet–Ethiopian alliance assumed a formal shape. On 6 May, during an official visit to the USSR, Mengistu signed a ‘Declaration on the Foundations of Friendly Relations and Co-operation’ between the USSR and Ethiopia. At the same time, the Soviet government concluded its second major arms package with Mengistu, reportedly worth $385 million. The agreement coincided with reports that a substantial number of Cuban military advisers had arrived in Addis Ababa.