New Delhi, June 10 -- Bhutan's Prime Minister Tshering Tobgay extended wishes on behalf of the King, the Royal Government and the people of Bhutan as Prime Minister Narendra Modi becomes India's longest-serving elected Prime Minister.

In a heartfelt letter shared on X, he called PM Modi his friend, brother and mentor and recalled how since their first meeting in 2014 the leaders have seen sustained momentum in their ties.

He termed it a moment of historic significance for India and hailed PM Modi's leadership prowess in guiding India through a transformative period.

The Bhutanese PM recalled his first meeting with PM Modi in 2014 and noted how since then conversations between the two have ranged from matters of development to opportuni...