First up, Bloomberg, November 19:
Ukraine Hits Russia With Western-Made Missiles for First Time: Report
New York Times, November 19:
Putin Lowers Russia’s Threshold for Using Nuclear Arms
Pravda (English), Nov. 19:
Russia has begun mass-producing mobile shelters "KUB-M"
And Russia's rationale for reacting to these particular weapons, via Pravda, November 17:
PUTIN THREE WEEKS AGO ON RESPONSE TO THE THREAT OF A LONG-RANGE MISSILE ATTACK ON RUSSIAN TERRITORY: “our military department is thinking about it and will offer several options for response”
....The point is not whether someone will be allowed to use these weapons against Russia or not.
I already mentioned this in my very first statement, when I was in St. Petersburg.
Ukrainian troops cannot use these weapons alone.
This can only be done by specialists from NATO countries, because this requires space reconnaissance, which of course Ukraine does not have, we understand.
We need specialists who, based on this reconnaissance data, will go on flight missions and perform a number of other manipulations.
The Ukrainian military cannot do this alone.
Therefore, what is happening now is all being done by NATO officers.
The only question is whether they will allow themselves to strike deep into Russian territory or not ? That is the question.
Of course, we will have to react accordingly.
How to react, when, where exactly, it is too early to talk about it.
But of course, our military department is thinking about it and will offer various answers...
....MORE
Recently:
November 17 - "The Decision To Allow U.S.-Made Munitions To Bomb Russia Sure Got Moscow's Attention"