Japan
The concentration.
It is, for example, a buffer zone between two hostile nations that serves to prevent conflict
different reactions from weak acids and conjugate bases changes the behavior in the buffer
The molarity of the buffer and the hydrogen concentration of the buffer.
The country that had the buffer zone satellite countries in WWII was Russia.
Mongolia.
Poland, Lithuania, Latvia and Estonia.
Mongolia is a perfect example of a buffer state, as it rests between China and Russia. A buffer state is housed between two large and hostile powers.
Communist countries between Russia and Western Europe acted as a buffer between the countries.
It wasn't because he liked Piroshkas. He wanted a buffer between Germany and Russia.
Japan
Buffer state is a country between to competing regions. The buffer states in Asia are: Mongolia, North Korea, Sultanate of Aceh, Siam, Far Eastern Republic, Afghanistan, Tibet, and the Himalayans.
Neither. The size hasn't changed since the 1800's for the main part of the country. Since 1989 they have lost the satellite countries, but they were the buffer zones between the west and themselves.
Mongolia, even though its role as a buffer is limited because Russia has a 3,645-kilometer long border with China in addition to a 3,485-kilometer long border with Mongolia. In other words, should China decide to invade Russia, or other way around, they could cross the vast border directly without having to go through Mongolia.
literally every country
No. There would have been a response from Russia if United States troops were on their border. The closest we are to Russia would be Poland which is a NATO country and is a buffer between Eastern Europe and Central Europe.