NEW DELHI (AP) ― Officially, Pakistan President Asif Ali Zardari is just having a quick lunch with India’s leader on his way to visit a Muslim shrine. But Zardari’s trip to New Delhi on Sunday marks a milestone in the warming relations between the two neighbors.

Such are the pressures on the nuclear-armed rivals that even as they inch closer together, they cannot be seen as fully embracing.

Zardari can’t risk angering Pakistan’s hawkish army and its powerful anti-Indian Islamic groups by holding official talks with India. Indian Prime Minister Manmohan Singh faces pressure of his own to keep some distance from Pakistan until it cracks down on anti-Indian militants.

A year ago, Pakistan Prime Minister Yousuf Raza Gilani met with Singh during a World Cup cricket match, using the same cover employed in 2005 by then-President Pervez Musharraf for a meeting with Singh during an India-Pakistan cricket match.