LAST SUNDAY, while returning home from Pakistan aboard Air Force One, President Bush received a telephone call from his Russian counterpart, Vladimir Putin. The two men discussed several issues that threaten to disrupt U.S.-Russian solidarity in the war on terror--foremost, Russia's diplomatic support for Iran in the dispute over its nuclear program at the IAEA, and its decision to welcome Hamas, which recently won control of the Palestinian parliament, to Moscow. Russian Foreign Minister Sergei Lavrov is set to continue this dialogue in Washington this week in a series of direct talks with President Bush and Secretary of State Condoleezza...