(ANSA) - ROME, AUG 21 - Italy's biggest bank Intesa Sanpaolo is mulling complaint to bourse regulator CONSOB after Italy's third-largest and the world's oldest bank, Monte dei Paschi di Siena (MPS), on Friday launched two defensive share swaps worth some 34 billion euro with Italy's fourth biggest bank Banco BPM and with the wealth manager of Italy's top insurer Generali, Banca Generali to try to fend off a 30.6 billion unsolicited takeover bid by Intesa, launched in June. Intesa said it is i...