For all the fears of an outbreak of fighting in the Middle East that could draw the United States, Israel and Iran into direct combat, a curious feature of the conflict so far is the care taken in both Tehran and Washington to avoid putting their forces into direct contact.
The evidence of caution is piecemeal, but everywhere. While Tehran has ramped up its production of uranium drastically in recent weeks, renewing fears that it may be speeding again toward the capability of fabricating several nuclear weapons, it has carefully kept just below the threshold for bomb-grade fuel.
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