"We do not consider these weapons [North Korean missiles] to be technologically advanced, but it concerns us all the more because we cannot predict where the missiles could be flying," Vladimir Rakhmanin said in an interview with Moscow-based Ekho Moskvy radio.
Envoys from China, Japan, Russia, the United States and the two Koreas have recently discussed arrangements for the second phase of North Korea's nuclear disarmament process after Pyongyang promised to declare and deactivate all its nuclear facilities.
Rakhmanin said North Korea's missile tests had not been discussed at the recent negotiations, but that a Russia-led working group on security in northwest Asia, formed within the framework of the six-party talks, could raise the issue at any point.
North Korea conducted at least three test launches of short-range ballistic missiles this year, the latest being fired in June while the G8 summit was being held in Germany.
In April, Pyongyang demonstrated new medium-range missiles during a military parade. Some experts believe these missiles are an improved version of Soviet-made SSN-6 Sawfly with estimated range of up to 4,000 kilometers (2,500 miles).
In May 2005, the country launched short-range missiles from its eastern coast, and in July 2006 a total of seven missiles, including the Taepodong-2, which has a range of up to 6,000 km (3,700 miles).
The reclusive Communist state first test-fired a long-range ballistic missile over Japan in 1998, prompting Tokyo to begin researching missile defense.
