Foreign Minister Tzipi Livni on Tuesday expressed her concern over anti-Semitism in Europe during a meeting with visiting European Parliament President Hans-Gert PÃ¶ttering. Livni called on the European Parliament as well as on European leaders to denounce anti-Semitic incidents and to encourage appropriate legislation prohibiting them. "We cannot allow this ugly phenomenon to raise its head, and it is upon the leaders of Europe and the international community to use all the means at their disposal to loudly and clearly oppose it," Livni said. Livni went on to speak of Iran and its links to Middle East terror organizations, noting that "the international community must impose severe sanctions to prevent Iran from equipping itself with nuclear weapons. A nuclear Iran will constitute a threat to the stability of the region and on the possibility of attaining peace in the Middle East." The Foreign Minister stressed the importance of the continued isolation of Hamas and the adherence to the three Quartet principles regarding the organization. She also emphasized that Hamas rocket attacks prompted the recent IDF operation in Gaza and that Hamas alone was responsible for the suffering there.