Why not? Greece and Turkey are mortal enemies, and have a war going on between one another as a result of the Turkish aggression against Cyprus. What would be so surprising about Russia seeking admittance? Does not "want" to join NATO, or would be unlikely to "be admitted" to NATO at present?
In order to understand why it would be surprising and unlikely that Russia would enter NATO in its present form one must understand the overall big picture of US foreign policy since after the end of the cold war. This is clearly articulated in the "Wolfowitz Doctrine" that laid out the post cold war strategy of the US. This strategy was adopted in the early 90s and was the foundation for the "Bush Doctrine", which btw Obama hasn't fundamentally changed.
http://en.wikipedia.org/wiki/Wolfowitz_Doctrine
In sum, the Wolfowitz Doctrine calls for a unipolar world while preventing at all costs an emerging rival superpower or block of countries that could challenge the global supremacy of the US/NATO's authority (i.e. this is the "New World Order" doctrine).
Next, the only countries on their own that have the combined military/economic capability to come even close to anything that NATO has are Russia, China, and a combination of countries in Eurasia (some say the SCO is the birth of "NATO of the East").
http://en.wikipedia.org/wiki/Shanghai_Cooperation_Organisation
The Wolfowitz Doctrine is the big picture, overall strategy of the US and NATO in the post cold war period and to a large extent regional policies are designed to meet its objectives. Think of the missile shield, surrounding both Russia and China with military bases/allied regimes, etc.
Anyways, back to Russia. If Russia were to join it would have to be subordinated as Russia in its current form would take too much power away from Washington and Brussels for them to want it to join. To me, there are 2 main reasons why Russia would not join NATO now (despite the fact that NATO is a western alliance and Russia is not in the "West").
1. It retains a credible nuclear deterrent. The missile shield is eventually striving to deny Russia in the sense that it would not have a retaliatory capability in the event of nuclear war and thus creating a situation of nuclear primacy for NATO and ending MAD (mutually assured destruction). It is comparable to a situation where two people each have guns pointed at each others head and one does a Jiu Jitsu move to knock the gun out of the other's hand. In this case, the gun would be pointed at Russia's head and it would have nothing to point back. Russia would thus be subject to nuclear threats with no credible responses and would thus lose a significant amount of its sovereignty.
2. Russia under Putin is a very, very different Russia than that under Yeltsin. Yeltsin let the IMF/World Bank and their allied "Oligarchs" run amock on the Russian economy, laying the foundation for the "Economic Hitman" formula that John Perkins has laid. Putin, regardless of what you think of him, on the other hand is a staunch Russian nationalist and reversed all of this, kicking the IMF/World Bank out and arresting Oligarch and international financier types like Mikhail Khodorkovsky. Imagine for a second a US President having the cajones to kick the IMF/World Bank out of the US and arresting people like George Soros...
http://en.wikipedia.org/wiki/Mikhail_Khodorkovsky
In short, if the missile shield is successful and Putin is removed and replaced by a Yeltsin type stooge, then I can picture Russia joining NATO. Short of that, I'd say its a long shot.
The Wolfowitz Doctrine is the exact opposite of Non-interventionism and the ideals of the US founders when it comes to foreign policy and minding our own business (not to mention the cost of maintaining this insane policy in blood and treasure)