Vice President Daniel Scioli said the islands "always were and always will be" rightfully an Argentine territory, referring to them as the Malvinas, as they are known in the South American country.
April marks the 25th anniversary of the short-lived war between Argentina and Britain over the islands.
The 74-day war between the nations over the islands off the coast of Argentina left more than 900 people dead, 655 of them Argentine soldiers.
Argentina has repeatedly called on Britain to hand the islands over.
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