Italian Prime Minister Enrico Letta, who assumed office on April 28, appointed Mistura as his Special Envoy to handle the marines issue.
The decision has been conveyed by Italy to India. Mistura will work with External Affairs Minister Salman Khurshid on the issue.
India has already conveyed its intent to work out a balanced approach.
Mistura has been a frequent visitor to India ever since two Italian marines -- Massimiliano Latorre and Salvatore Girone -- were arrested in connection with the two Indian fishermen in February last year off the Kerala coast.
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A fortnight back the Supreme Court backed the government decision to ask the National Investigation Agency, which usually handles cases of terrorism, to probe the killing of two Indian fishermen by the Italian marines.
Khurshid had sought to reassure the Italian government that the assignment of the case to the NIA should be seen only as a task given to a probe agency not under the NIA Act but by nomination.