There is no such country.
There is no such country and therefore no such capital. If perhaps you meant to ask about the Mediterranean and Black Seas, the answer would be Turkey. If perhaps you meant to ask about the Baltic and Black Seas, the answer is Russia.
Russia.
Both Sweden and Finland
Egypt is the only African country that borders both the Red Sea and the Mediterranean Sea.
Denmark borders both the Baltic and the North Sea. Denmark's closest country is Sweden.
You're missing part of question. Both the Mediterranean and ?
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.
Turkey
Egypt is the only country that borders the Mediterranean and the Red Sea. Its capital is Cairo.
Ankara is the capital of Turkey, which is the only country that is bordered by BOTH the Mediterranean Sea and the Black Sea. It is worth noting that the city of Ankara itself is a landlocked city and is nowhere near the Mediterranean Sea or Black Sea; it is the country of Turkey which borders both.
Ankara is the capital of the Republic of Turkey, the only country that borders both the Mediterranean Sea and the Black Sea.