ato also called on Russia “to respect its international commitments, to stop the flow of arms and weapons across the border, to stop supporting armed separatists in Ukraine”, she added.
Mr Grushko later told Russian Interfax news agency that Moscow might pull out of the Founding Act – a co-operation treaty – with Nato and take “measures of a military character” if there were major deployments in eastern and central Europe.
“We shall wait and see what the ministers decide,” he said.
“But if it means additional deployment of substantial Nato military assets in central and eastern Europe, and we are hearing calls for just that, then even if it takes place as a troops rotation we will have difficulty viewing it as anything other than a direct breach of obligations in the fundamental Russia-Nato documents including the Founding Act.”
He added: “All this could cast Europe back to the days of the Cold War and launch an arms race.”
Kiev and the West have accused Russia of stirring up separatist sentiment in parts of eastern Ukraine where the majority are Russian-speaking.
Russia, which denies the claims, is seeking an emergency meeting of the UN Security Council to call for an immediate end to fighting in east Ukraine.
On Monday, hundreds of heavily-armed insurgents resumed a sustained assault on a border guards’ command post near the city of Luhansk.
Nato ministers, who are holding two days of talks in Brussels, will also discuss the end of the combat mission in Afghanistan and US plans to train and advise Afghan forces after 2014.
