The South Korean Foreign Ministry has summoned the Russian ambassador to Seoul.
The reason for inviting Georgy Zinoviev was information about the movement of North Korean troops to Russia.
An official statement on the South Korean Foreign Ministry's website said the situation poses a security threat to the international community.
South Korean authorities demand an immediate withdrawal of troops and call for an end to military cooperation between Russia and the DPRK.
It is also emphasized that these actions violate several UN Security Council resolutions and the UN Charter.
The Russian embassy in Seoul said that Zinoviev was invited for a conversation.
The ambassador listened to the position of the South Korean Foreign Ministry and promised to convey the information to the Russian side.
The South Korean Foreign Ministry is concerned about possible rumors and the consequences of closer cooperation between Russia and the DPRK.
