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Turkey
japan
The Arctic Ocean borders Asia in the north.
Europe and Asia are both continents, not countries. And Bulgaria is a country in the continent of Europe.
Russia is partly in Europe and partly in Asia, along with Turkey.
ASIA
Malaysia, which is in Asia.
Asia is a continent and Russia is a country, Bashkortostan is in Russia and borders Europe and Asia.
Russia is itself partly European and partly Asian, so must be closest! Turkey is mostly in Asia but has a small part in Europe.
There is no country that borders all three countries.
From a geological point of view, Turkey is unique in that it has landmass in both Europe and Asia. Could you not argue Russia borders both Europe & Asia?
Bulgaria isn't even on Asia...