Definition: In this task, you are given a text of the article. Your task is to generate a headline (title) for this article.
Input: nato secretary general jaap de hoop scheffer said thursday an upsurge in taliban attacks in afghanistan was aimed at `` testing '' western public opinion and warned the alliance would take tough action against anyone trying to derail afghan reconstruction .

nato issues stern warning to afghanistan 's taliban by philippe UNK UNK UNK UNK detail UNK