The new Taliban alliance has raised concern in Afghanistan, where NATO generals warn that the conflict will worsen this year. It has also generated anxiety in Pakistan, where officials fear that a united Taliban will be more dangerous, even if focused on Afghanistan, and draw more attacks inside Pakistan from United States drone aircraft. “This may bring some respite for us from militants’ attacks, but what it may entail in terms of national security could be far more serious,” said one senior Pakistani official, who spoke on condition of anonymity because he is not permitted to talk to news organizations. “This would mean more attacks inside our tribal areas, something we have been arguing against with the Americans.”