The NYT piece this Article is predicated on is definitely a 'hit piece' on Trump and reeks of intelligence leaks.
The Obama administration had sought to persuade the Russians to correct the violation while the missile was still in the test phase. Instead, the Russians have moved ahead with the system, deploying a fully operational unit.
Administration officials said the Russians now have two battalions of the prohibited cruise missile. One is still located at Russia’s missile test site at Kapustin Yar in southern Russia near Volgograd. The other was shifted in December from that test site to an operational base elsewhere in the country, according to a senior official who did not provide further details and requested anonymity to discuss recent intelligence reports about the missile.
American officials had called the cruise missile the SSC-X-8. But the “X” has been removed from intelligence reports, indicating that American intelligence officials consider the missile to be operational and no longer a system in development.