President Vladimir Putin said on Tuesday that there was nothing to stop Russia and the United States holding talks with other countries about the possibility of them joining a landmark arms control treaty that is at risk of unravelling.
The United States delivered Russia a 60-day ultimatum earlier this month to come clean about what Washington says is a violation of the Intermediate-range Nuclear Forces Treaty between Moscow and Washington.
The pact keeps intermediate-range US and Russian missiles out of Europe. Washington has spoken of quitting the treaty altogether unless Russia returns to what it calls "full and verifiable compliance."