The case of the marines has "huge implications for Italy but also for all countries engaged in anti-piracy" measures, Ashton said after a meeting with 28 EU foreign ministers here yesterday.
The European Union "needs to send a strong message" to New Delhi because measures to combat piracy and even terrorism taken by countries in Europe may be at stake in the case, she was quoted as saying to EU ministers by Italian news agency ANSA.
Her comments came on the same day Italian Prime Minister Enrico Letta warned the country and the EU would "react" to India's "unacceptable" move to invoke the anti-piracy law against the marines.
"The charge sought by Indian authorities is unacceptable," Prime Minister Enrico Letta said in a message on his Twitter handle. "Italy and the European Union will react."
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Both the leaders reacted after Indian authorities said the National Investigation Agency (NIA), which is probing the matter, would prosecute marines Massimiliano Latorre and Salvatore Girone under the strict maritime security law SUA. The SUA carries death penalty.
Yesterday, India's Supreme Court set February 18 as the next date for hearing arguments from both the sides on the use of the anti-piracy law.