He alleged that a few Maldivians were involved in this "plot" of which he gave no details, either about the foreign power allegedly involved or when the attempt was made.
"Undoubtedly, the biggest challenge to our national unity in our contemporary history was the failed attempt, encouraged by a foreign power, to create a breakaway republic comprising of the three southern-most atolls in the country. It was not surprising that a few Maldivians were, yet again, involved in this plot," he said in an address to mark the 50th anniversary of the country's independence yesterday.
"It is regrettable that every occasion that we were subjugated by foreign powers was instigated, aided and abetted by a handful of treacherous Maldivians," he said at a function which was attended by several foreign dignitaries, including Sri Lankan President Maithripala Srisena.
Prime Minister Narendra Modi had also greeted Maldives on its foundation day yesterday and said that India's ties with it were built on a very strong foundation.
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The Maldivian leader said that threats from outside are far more dangerous than those from within, and the countrymen be vigilant and watchful against such threats.
"Attempts by developed and technologically more advanced countries to interfere and intervene in domestic affairs of small and less developed countries, under the guise of ideology and cultural norms, is a reality that we must comprehend, counter and condemn, as such attempts that erode a country's sovereign rights clearly contravene international norms and global compacts," he said.
48-year-old Nasheed, the country's first democratically elected leader who was arrested on February 22 over the detention of a judge in 2012, was charged under the Anti- Terrorism Act 1990 and was sentenced to a 13-year jail term.
His conviction and sentencing drew widespread criticism over the apparent lack of due process in the 19-day trial and tarnished the country's image as a tourist destination.