The free-trade agreement between Japan and Mexico due to be signed this week in Mexico City will be a landmark treaty benefiting both sides, according to the Mexican ambassador.

"This treaty is a very important and a historic agreement for the bilateral relationship between Mexico and Japan, because with this treaty we will institutionalize our economic relations for the coming decades," Miguel Ruiz-Cabanas said in a recent interview.

"Japan and Mexico have always enjoyed a very special bilateral relationship," Ruiz-Cabanas said. Mexico, in 1888, became the first country that allowed Japan to sign a treaty of amity and trade, Japan's first reciprocal and equal pact with any other country.