In 1998, O'Connor questioned whether the United States' cruise missile strikes on Afghanistan and Sudan were morally justifiable. In 1999, during the Kosovo War, he used his weekly column in the archdiocesan newspaper, "Catholic New York", to challenge repeatedly the morality of NATO's bombing campaign of Yugoslavia, suggesting that it did not meet the Catholic Church's criteria for a Just War, and going so far as to ask, "Does the relentless bombing of Yugoslavia prove the power of the Western world or its weakness?" Three years before the &lt;a href="September%2011%20attacks"&gt;9/11 attacks&lt;/a&gt; on New York City, O'Connor insisted that the traditional Just War principles must be applied to evaluate the morality of military responses to unconventional warfare and terrorism.