Of COURSE Russia has developed a new intermediate-range missile system. It's the logical response to the USA stationing missiles in Eastern Europe.

Russia, diplomatically, practically begged the USA not to station the new missile systems in Eastern Europe. The Americans did anyway, giving the ludicrous reason that it was needed to counter a missile threat from Iran. This response by Russia is a direct consequence of America's previous aggressive move.

By the way, the new system doesn't provide the Russians with any capability they didn't have before. It's just another option in delivering a weapon to a target.