German Chancellor Angela Merkel (L) reviews an honor guard with visiting Italian new Prime Minister Enrico Letta in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)

Visiting Italian new Prime Minister Enrico Letta speaks during a press conference with German Chancellor Angela Merkel (not shown in the picture) in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)

German Chancellor Angela Merkel (R) welcomes visiting Italian new Prime Minister Enrico Letta in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)

German Chancellor Angela Merkel (R) attends a joint press conference with visiting Italian new Prime Minister Enrico Letta in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)

German Chancellor Angela Merkel (R) attends a joint press conference with visiting Italian new Prime Minister Enrico Letta in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)

German Chancellor Angela Merkel (R) attends a joint press conference with visiting Italian new Prime Minister Enrico Letta in Berlin, April 30, 2013. Merkel paid tribute to Italy's efforts on fighting the debt crisis as she met Italy's new Prime Minister Enrico Letta on Tuesday. (Xinhua/Pan Xu)