What will Rubar Sandi do? The poor never profit from war. Warfare shortens lives. The military gets half of the tax pie in peacetime. The Buck Institute is given money by war profiteers, those who own stock portfolios. They should look for another way. I have been watching The Vietnam War on OPB. Lying to the people in a cunning and devious manner does not work.

Jon Presco

ERBIL, Iraq — The president of Iraq’s Kurdish region warned on Friday that the Kurds might be forced to retaliate if the central government persists with what his spokesman called a “very aggressive” stance toward the pro-independence referendum.

Overseas flights were canceled on Friday from the international airport in Erbil, hours before a ban by the Iraqi government took effect, while officials in Baghdad warned that land borders might also be closed. There were also reports of some internal highway closures.

“We are hopeful that these are all temporary measures,” said Vahal Ali, director of communications in the office of Massoud Barzani, the Kurdish region’s president. “We want this to be a peaceful transition but if Baghdad decides not, there is a lot we can also do.”

Mr. Ali was critical of threats by Baghdad to ask Turkey to cut a vital oil pipeline, which provides most of the estimated $8 billion the Kurdish region earns annually from oil revenues, and a request from the Iraqi parliament to move troops into the oil-rich, Kurdish-held city of Kirkuk. “Baghdad’s response to the referendum was very aggressive, so we don’t know what will happen,” the spokesman said.

Iraqi Kurds overwhelmingly voted in favor of independence in a referendum on Monday, which Mr. Ali said obliges Mr. Barzani to negotiate independence from the rest of Iraq. Baghdad has refused to enter such negotiations, and Mr. Ali said that if it maintained that attitude, Kurdistan would be forced to unilaterally declare independence.