In the weeks immediately following the Vienna summit, more than 20,000 people fled from East Berlin to the western sector, reacting to statements from the U.S.S.R. Kennedy began intensive meetings on the Berlin issue, where Dean Acheson took the lead in recommending a military buildup alongside NATO allies. In a July 1961 speech, Kennedy announced his decision to add $3.25 billion (equivalent to $ billion in ) to the defense budget, along with over 200,000 additional troops, stating that an attack on West Berlin would be taken as an attack on the U.S. The speech received an 85% approval rating.