It is one of the fiercest rivalries in sports. It cranks up nationalistic fervor in two nuclear-armed neighbors. It draws viewership across the world, given the vast diasporas of the two competitors: India and Pakistan.

And yet somehow the game of cricket has, at times, offered a fragile semblance of civility even during the most strained moments between the two countries. Tensions away from the sport, it was said and hoped, could be cooled on the field with a simple handshake between the two teams.

But none of that was in evidence on Sunday night.

India and Pakistan were facing off in the United Arab Emirates in a group stage game of the Asia Cup tournament. Batting second, India cruised to victory. Then, with barely a glance backward, the Indian players walked off the field. No handshakes. No exchange of pleasantries.

“We were ready to shake hands,” said Pakistan’s coach, Mike Hesson, a New Zealander. “But they had already gone in.”

In a postmatch news conference, Suryakumar Yadav, the Indian captain and the player who scored the winning runs, said that the snub had been planned.

He dedicated the win to India’s armed forces and to the victims of a massacre in which 26 people were killed on the Indian side of Kashmir in April that his country’s prime minister, Narendra Modi, described as a “terror attack.” India accused Pakistan of being involved in the assault, a claim that Pakistan denied. The episode led to some of the worst fighting in decades between the two countries before a cease-fire was declared.