China, India and Pakistan’s dangerous nuclear triangle just became more complicated

The China-India-Pakistan triangle has never been short on danger, but Islamabad’s new defensive alliance has added another variable to an already volatile situation.
Last week, Pakistan, Turkey and Saudi Arabia signed a pact in Mecca in which they agreed to treat an armed attack on one as an attack on all. The three governments have described it as defensive and not directed at any particular state.
Analysts said its main significance for India lay less in whether it would be invoked, but in how...