There is no such country.
Both Sweden and Finland
Denmark borders both the Baltic and the North Sea. Denmark's closest country is Sweden.
Iran is the only country that borders both the Caspian Sea and the Persian Gulf.
Yes. Iran is the only country that borders both the Caspian Sea and the Persian Gulf.
Poland borders both Germany and Russia and is located on the Baltic Sea, however the federal subject that borders Poland is separated from the main body of Russia and its other federal subjects.
Russia is the only country having borders on both seas.
Caspian Sea.
baltic sea
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.
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.