Pakistan: We're ready for war with India . And: Pakistan, India troops exchange fire at Chakoti sector

A bit off-topic but a nuclear exchange would probably have some climate effects.
From the Telegraph:

Pakistan warned it is ready for war with India if it is attacked following the strike by the Mumbai terrorists.

The remarks by Pakistan's foreign minister, Shah Mehmood Qureshi, who also insisted he would not hand over any suspects in the Mumbai attacks, come amid mounting tensions between the nuclear-armed neighbours.

India has said it is keeping all options open following last month's carnage by the Mumbai terrorists, who killed more than 170 people.

"We do not want to impose war, but we are fully prepared in case war is imposed on us," said Mr Qureshi....MORE

And from INS:

MUZAFFARABAD: Pakistani and Indian troops traded fire at Chakoti Line of Control, causing panic among the locals. On Saturday night at 9:00 pm, Indian troops violating ceasefire opened indiscriminate firing at positions of Pakistan army in areas of Pando and Opi, Chakoti sector.

The Indian troops used small weapons and mortar guns in the firing that lasted more than one hour. Pakistan army retaliated with same force....MORE

Here's Monty Python's Michael Palin in his role as travel writer at the Wagah border crossing. If you haven't seen it, it's umm, macho: