Aviatorpk,
Historically, soviet block aircraft have used different avionics systems and standards in some regards. However, TCAS is a relatively modern specification.
With reference to the recent collision (I presume this is the point of your question), it has been stated on another thread that the aircraft was ACAS equipped.
ACAS is a JAA standard for an Airborne Collision Avoidance System (ACAS). This requirement is only met by the most recent software version (v7) of TCAS 2. It is a requirement, for all but the smallest aircraft, for flight in the European Air traffic System.
So, to answer your question, Yes.
Plane speaker.
Yes, but the systems would only interrogate one anothers traansponders. There would be no coordination between the systems.
i.e. TCAS 1 aircraft would only receive a traffic advisory (thats all TCAS 1 does anyway).
Hence the TCAS 2 aircrafts Resolution Advisory (if required) would be uncoordinated.