These are FREMM Italian navy frigates. Along with a San Giorgio LPD and one (or perhaps two, the Defence Minister was unspecific) other ships with characteristics that also seem really useful - admittedly aircraft carriers have a certain grandeur but sometimes grandeur is not what is needed - they have set off towards Libya.
The Sabratha platform and Greenstream are attracting more commitment to "un ruolo di sicurezza, deterrenza " e di "dissuasione" in General Claudio Graziano's words, than the migrants being trafficked in rubber boats.
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