Russia plans to install new anti-missile defence systems on its border with North Korea in the wake of the international controversy over the sinking of a South Korean warship in March, the Itar-Tass news agency reported on Tuesday.
The army will station two modern systems of the S-400 type near the border, an employee of the Defence Ministry was quoted as saying.
He added that Russia is 'very concerned' about North Korean missile tests, noting that the test site is 'alarmingly close' to the Russian border.
South Korea has blamed North Korea for the sinking of its Cheonan corvette near the two countries' disputed maritime border in the Yellow Sea, which left 46 sailors dead.
An international investigation found that a North Korean torpedo was responsible for the blast that brought down the ship, but Pyongyang has denied any involvement.