Reddit mentions of Wars and Insurgencies of Uganda 1971-1994 (Africa@War Book 23)

Yes and no. That is: yes, I do, but none of these launched any kind of such military interventions like Cuba has.

For example: no matter how much encouraged by the Soviets to 'provide their share in internationalism', the East Germans haven't had that much to provide. Correspondingly, and just like Hungarians and Bulgarians, they usually limited themselves to provision of vehicles, small arms, and/or advice in regards of organising intelligence services.

If I'm to ask, it's the Czechoslovaks that were 'much more interesting' - and nearly always mis-identified as 'East Germans' - at least during the (I) Cold War: one should keep in mind that by early 1970s, Czechoslovakia was one of five top arms exporters World-wide; that the Czechoslovak (and not Soviet) advisors were crucial for (re-)establishing and training the Syrian armed forces for all of 1960s and much of 1970s; that they were exporting their arms all over Africa too, and training lots of local armed forces (see Libya, Uganda, Nigeria, Ghana etc., etc., etc.). Indeed, in Libya of 1980s, the Czechoslovaks run at least three pilot-schools, plus a COIN asset equipped with Aero L-39s (and thus became involved in the War in Chad); most of Libyan T-72s and BMP-1s were made in Czechoslovakia etc.

Poles came second, well after the Czechoslovaks. They constructed the Syrian Air Force Academy air base at Kweres AB, were selling T-72s and similar stuff to Iraq, Syria and few other countries.

North Koreans are their own story: one that has to be seen in its own light - because they were never as tightly controlled by the Soviet s as East Europeans were. They were usually deploying their advisors - and sometimes combat troops - on invitation from the host government. For example:

• A group of up to 40 North Korean pilots was deployed in North Vietnam during the Op Rolling Thunder. Quite a few of them got killed (for example: in Operation Bolo), and buried in Vietnam, but Hanoi then simply deleted all the related files (ironically, the NSA did the same with its recordings of intercepted radio messages in Korean...).
  
  
• A group of about 40 North Korean pilots, cooks and translators served in Egypt during the October 1973 War. Due to language differences, they flew CAPs over the Aswan area and - despite some Israeli claims of the contrary - never saw any combat.
  
  
• Slightly later (writing this from memory), Mobutu contracted North Koreans to help him build-up the Zairian armed forces ('Zaire' was the official designation of the DR Congo from 1971 until 1997). They helped train multiple big and 'heavy' units in mid-1970s (for details, see Kolwezi), though with only meagre success: their and the temperaments of the Congolese were quite 'incompatible'. Moroccans - who deployed to Zaire in 1977 and again in 1978 - and even Egyptians, seem to have been slightly more successful (and influential) in this regards.
  
  
• The North Korean advisors were present in the DR Congo under Kabila of late 1990s, too, when they trained one of newly-established units of the reconstructed Congolese armed forces (for details, see Great Lakes Conflagration).
  
  The Chinese are also 'their own story': in essence, Beijing was acting entirely independently from the USSR, solely in its own interest, which - contrary to the Cuban and Soviet interests - was frequently rather 'commercial' than 'ideological' by nature. The Chinese have played a crucial role in the establishment of the Tanzanian armed forces (for details, see Wars and Insurgencies of Uganda), and they were supporting and advising the UNITA of 1970s and 1980s. Much less is known about their involvement in the Zambian armed forces of 1970s.
  
  In other cases, the Chinese appeared as contracted support personnel for local arms acquisitions. For example, in early 1980s, there was a Chinese team helping the Sudanese become operational on their Shenyang F-6s around the same time Americans were training the locals on Northrop F-5s and the British on BAe Strikemasters. Around the same time, another Chinese team was present in Somalia, which bought about 30 Shenyang F-6s, and - and thanks to the influence of the Pakistani advisors contracted by the Zimbabweans - the Chinese also helped the local air force acquire their Shenyang F-7 interceptors.