The three major facts:
the NSA listed Cavium, an American semiconductor company marketing Central Processing Units (CPUs) - the main processor in a computer which runs the operating system and applications - as a successful example of a "SIGINT enabled" CPU vendor. Cavium, now owned by Marvell said it does not implement back doors for any government.
the NSA compromised lawful Russian interception infrastructure, SORM. The NSA archive contains slides showing two Russian officers wearing jackets with a slogan written in Cyrillic: "you talk, we listen". The NSA and/or GCHQ has also compromised "Key European LI [lawful interception] systems.
among example targets of its mass surveillance program, PRISM, the NSA listed the Tibetan government in exile.