WASHINGTON  Israel, America’s staunchest ally in the Middle East, just became the latest example of a country that has decided it is better to deal with its foes than to ignore them.

The announcement that Israel has entered into comprehensive peace talks with Syria is at odds with the course counseled by the Bush administration, which initially opposed such talks in private conversations with Israelis, according to Israeli and American officials. A week ago, President Bush delivered a speech to the Israeli Parliament likening attempts to “negotiate with the terrorists and radicals” to appeasement before World War II.

“We have heard this foolish delusion before,” Mr. Bush said. “As Nazi tanks crossed into Poland in 1939, an American senator declared, ‘Lord, if only I could have talked to Hitler, all of this might have been avoided.’ We have an obligation to call this what it is: the false comfort of appeasement, which has been repeatedly discredited by history.”

But in many ways, the Bush administration’s own policies appear to be at odds with his thesis.

While Mr. Bush and his advisers have repeatedly scorned the idea of talking to enemies without first getting preconditions met, administration policy over the last seven years has been far more nuanced. In fact, the United States under the Bush administration has shown a sliding definition of just when it is beneficial to talk to whom.