The Japanese authorities have crossed the line of decency with their statements regarding Russian President Vladimir Putin's visit to the Kuril island of Iturup, Russian Foreign Minister Sergey Lavrov said, Kommersant reports.

The Russian foreign ministry had summoned the Japanese ambassador, but the latter stated that he could not come to  the ministry either on August 14 or 17.

Lavrov noted that the ambassador's behavior "causes surprise."

"Either he is not in Moscow, or he does not feel well... Of course, this causes surprise, because the ambassador is known for his inexhaustible energy. In any case, we have summoned the ambassador, he should come to the [Russian] foreign ministry, and we will talk... about how the ambassador should structure his work in the host country, respecting its laws," the Russian foreign minister stated.