LSAT PrepTest 44 Section 4 Question 26 Explanation | Logical Reasoning

Here's a Logical Reasoning question from the October 2004 LSAT.A chain of phrases should help here:Must respond aggressively to have strong foreign policy --> Everyone must think problem's grave --> EU won't, unless economy's threatened --> not all EU members strong in foreign policyWhere's the jump here, the place where the logic breaks down and an assumption is needed? The argument goes from