The United States has begun its military campaign in Afghanistan without first forging a post-Taliban regime. Although opposition forces will take advantage of U.S. air strikes to attempt to drive the Taliban from power, this will only usher in another round of fighting among the victors. Because the United States needs a friendly and stable regime in Kabul to facilitate its primary mission of rooting out Osama bin Laden and his Afghan Arabs, it will find itself drawn into an attempt at nation-building in Afghanistan. This is an intractable problem that could draw the United States into a lengthy, costly and ultimately doomed engagement in Afghanistan at the expense of its primary mission.
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And I'm sure the Russians have their interests in Afghanistan. For what it's worth, the Drudge Report reports the following:

The Russian military has secretly positioned troops on the outskirts of Kabul for an assault on the Afghan capital together with the opposition Northern Alliance forces, the Russian weekly Moscow News said Tuesday.

The weekly said Russian troops are operating tanks that had been given to the Northern Alliance as part of Moscow's military aid and are awaiting orders for an offensive against Kabul.

The maneuver is aimed at beating American forces in entering Kabul not only for the sake of Russian honor, but also to secure a role for Russia in shaping the post-Taliban order in Afghanistan, the weekly said.

In addition to supplying vast amounts of weaponry to the forces fighting the Taliban government, Moscow has also sent "military experts, technicians and military advisers," the Moscow News report said.

A precedent to Russia taking this type of action was seen in June 1999 during the Yugoslavia war when Russian forces surprised the NATO-led international force and occupied the airport at the Kosovo capital.