China has shown no real interest in countries that don't have significant mineral or natural resources.
Your stats on Bulgaria are also completely backwards. Bulgaria has a very pro-west citizenship.
EU polls: http://www.ecfr.eu/article/public_opinion_poll311520
Bulgarians are pro EU as long as the majority still believes that they will have a better economic future. I dispute that will continue for very long considering the socio-economic collapse Bulgaria has experienced since they joined the EU.
There is no shared culture or historic ties to the West that will keep Bulgarians tied to the West once the EU starts to disintegrate.
Also, fearing Russia and loving Russia is not exactly the same thing.
We view each other as brotherly nations and there's not much that can change this, just as the Muslim populations on the Balkans view Turkey as their brotherly nation.
The only reason they all signed up for the EU is because of the promise of a better economic future, not because they want to be part of western culture.
During the last years it has become apparent that these promises will not materialize and that's why I expect that the EU will massively contract in the next years.
Bulgaria is today Orthodox Christian and has kept the culture of their "arch-enemy". If the majority of Bulgarians really viewed this as their arch enemy then they probably would have rejected this culture the same way that they have rejected the culture of the Turks (by the way in a extremely cruel way) after they regained their freedom.
When they saw it didn't work they basically started to control the church from within with their KGB.
If you don't believe me ask an Argentinian.
But not every country is equally valuable to the great powers.
China needs a strong commercial foothold in the mediterranean sea (ports) to control economic trade with the EU. (which is enormous compared to the trade with Argentina)
Russia could want to fracture the EU and NATO if the standoff with the EU & US continues and wants military cooperation and bases in the mediterranean sea.
Turkey wants to reestablish its influence over the muslim countries in the Balkans and since they are now EU candidate for almost 30 years (meaning: they will never be allowed to join) they will try to find an alternative. Even worse for them, the EU and US appears to be actively working on fracturing the turkish nation via the Kurds. For them it might be a question of life and death to push the West out of the balkans and the middle east.
But last time I heard of Hungary their government was seeking stronger ties to Russia and McCain called the PM a Nazi and compared his policies to those of Hitler.
I can't imagine that anyone would currently see Hungary as tightly integrated and focused on a future in the EU.
Edit: I believe the future of Hungary will be sovereign and block-free.
What would happen if Greece defaulted on western debt and aligned with Russia and China is certainly not a repeat of the fascist military dictatorship they had back then.
They most likely would have social-democratic governments in the next decades, exorbitant financial investment from both Russia and China and lots of Russian military bases on their territory.
This would most likely be the end of the EU (and NATO) as we know it, because from there Russia and Turkey would work on pushing the EU out of the Balkans, which would most likely work considering that all of the populations there have a strong preference and historic ties to either Russia or Turkey, depending on what country you look at.
Even in Bulgaria, which is currently in the EU and has a pro-EU government, about 80% of the population have pro-Russian sentiments regarding the conflict in the Ukraine.
This is why the EU and US will do whatever it takes to keep Greece in the EU, even if it means that they have to orchestrate a military coup in Greece or that they will have to print trillions to cover for the debt.