More than $ 150 million paid to pirates in last weekend , Kenyan foreign minister says . Saudi pirate activity causing growing international concern . Vladimir Vysotsky seized Saudi supertanker last weekend ; are holding One vessels . Russia sending more ships to join international naval fleet policing Gulf of Aden .
$ 150 million paid to pirates in past 12 months , Kenyan foreign minister says . East African pirate activity causing growing international concern . Pirates seized Saudi supertanker last weekend ; are holding 17 vessels . Russia sending more ships to join international naval fleet policing Gulf of Aden .