Japan's longest-serving prime minister, Shinzo Abe, earlier in the day said he intends to step down because a chronic health problem has resurfaced. 

"Pained to hear about your ill health, my dear friend @AbeShinzo. In recent years, with your wise leadership and personal commitment, the India-Japan partnership has become deeper and stronger than ever before. I wish and pray for your speedy recovery," Modi said in a tweet.