NATO allies say Russia’s SSC-8 missile system violates the INF Treaty (Picture: VGTRK).
NATO Secretary General Jens Stoltenberg has warned that the military alliance will respond to Russian violations of the Cold War treaty.
The US is currently in the process of pulling out of the Intermediate-Range Nuclear Forces (INF) Treaty - which it signed with the then Soviet Union, to stop the production, testing and deployment of land-based cruise and ballistic missiles with a range of 500-5,500 kilometres.
US President Donald Trump says Russia has breached the treaty, an accusation Moscow strongly denies.
It comes just one day after the UK's Defence Secretary linked Moscow to terror groups such as Al-Qaeda and the so-called Islamic State group.
Speaking at a press conference on the eve of the defence ministers meeting in Brussels, Jens Stoltenberg said:
"Moscow continues to develop and deploy several battalions of the SSC-8 missile.
"We all know that a treaty that is only respected by one side cannot keep us safe."
Jens Stoltenberg urged Moscow to comply again with the INF treaty it agreed bilaterally with the US in 1987.
He said the ministers will discuss "what steps NATO should take to adapt to a world with more Russian missiles".
But declined to say what measures are being considered.
Over the next two days, Defence ministers will meet in Brussels at NATO headquarters to discuss the INF treaty as well as defence spending and cyber security, amongst other topics.