The leaders of India and China are set to make their boldest attempt yet at rapprochement in talks this week just months after a dispute over a stretch of their high-altitude Himalayan border rekindled fears of war.
Prime Minister Narendra Modi is flying to the Chinese city of Wuhan for two days of talks with President Xi Jinping from today, mostly without aides, officials say, aimed at ending decades of distrust that has deepened as China, with an economy five times bigger than India's, asserts itself in the region.
Their differences are significant: as well as disputes over stretches of a 3,500 km (2,200 miles) border, the Asian giants are bumping up against each other in the Indian Ocean and squabbling over Xi's signature Belt and Road infrastructure initiative.
India signalled as recently as Tuesday its opposition to the grand trade and transport plan because one of its branches runs through Pakistani-administered Kashmir, which India claims.
For its part, China has been concerned about US efforts to draw India into a maritime "quad" of democracies, including Japan and Australia, in a part of the world they have begun calling the "Indo-Pacific" instead of the "Asia-Pacific", which to some places China too firmly at the centre.
At the same time, pressure over trade that US President Donald Trump has put on China is driving its efforts to improve ties with others facing the heat from Trump, including India.
China needs to get India on its side, said Hu Shisheng, director of the Institute of South and Southeast Asian and Oceania Studies at the China Institutes of Contemporary International Relations, a state-backed think-tank.
"As far as the United States is concerned, the Indo-Pacific is crucial, and for China, the Indo-Pacific is aimed at China. So China needs to win India over as much as possible," Hu said.
Both sides have stressed this is an informal meeting rather than a summit - without the pomp and flag-waving children - as a way, hopefully, get more done.
"It can provide a comfortable atmosphere for the two countries' leaders to have full and deep exchanges on important issues of mutual concern," said Chinese Foreign Ministry spokesman Lu Kang, days after the announcement of Modi's trip, which will be followed by another to China in June for a regional conference.