Pakistan vs Afghanistan?

Via CBC

Afghan President Hamid Karzai on Sunday said his country has the right to send troops into Pakistan to fight Taliban insurgents who launch cross-border attacks.

Speaking at a news conference in the Afghan capital, Kabul, Karzai threatened to send the troops after Pakistan-based Taliban leader Baitullah Mehsud, who vowed in May to send fighters into Afghanistan to wage war on foreign troops.

There are currently tens of thousands of foreign troops in Afghanistan, including about 2,500 Canadians, as part of the International Security Assistance Force created after a U.S.-led invasion toppled the former Taliban government in 2001.

Karzai said Afghanistan has the right to self-defence when it comes to the cross-border attacks.

"When they cross the territory from Pakistan to come and kill Afghans and kill coalition troops, it exactly gives us the right to go back and do the same. Therefore, Baitullah Mehsud should know that we will go after him now and hit him in his house," he said.

Why does this make me nervous?