Caspian Sea.
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.
China is the only country that borders both Russia and India.
The only country which borders both Russia and India is China.
The Mediterranean sea
Russia
The South China Sea
Alaska borders both Canada and Russia.
Both the Caribbean Sea and Gulf of Mexico.
There rea no countries which border both Russia and Switzerland.
Russia.
Both the Gulf of Mexico and the Caribbean Sea qualify as such.
Because both countries posses land in both Asia and Europe. Such as how Russia borders China and Finland, and Turkey borders Greece and Iran(Persia). ----