Russian Armed Forces was engaged in low level conflicts after the post-USSR dissolution. It's military was in an unstable position due to the transition. For China, it's still recovering from the Sino-Vietnamese War and the Tiananmen Square protests of 1989. The PLA's doctrine wasn't fully revised yet. It's navy and air force were mostly for defensive purposes at this period.
As many pointed out, this will only happen if Zhirinovsky became president. He is known to make hawkish statements when is he is angry.
ASB but the war goes on, neither side would make significant gains. The area between Russia and China in the northeast in a difficult area to fight in especially in the dead of winter. Both sides may decide to break out WMDs in the face of overwhelming forces. Pandora's Box opens. China can launch a handful of nuclear weapons on Russian cities and military bases across the border, maybe even send in a few H-6 bombers. Russia will be hurt, but China will be a radioactive wasteland at the end of the day.
www.globalsecurity.org
Page 81 (
https://www.tandfonline.com/doi/pdf/10.2968/066004008):
Year | United States | Russia | United Kingdom | France | China | Israel | India | Pakistan | North Korea |
1993 | 23,575 | 43,000 | 422 | 420 | 230 | 47 | no data | 0 | 0 |
The withdrawal of soviet forces from Europe was complete by then ?
Russian forces only completely left Germany and Eastern Europe in March 1994.
www.nytimes.com
More likely while the Chinese are mobilizing they'll do some visible submarine patrols, fly some bombers with nukes in them, make sure their deterrent is very visible. It's called signaling. It's an important part of nuclear policy to be able to do so. And it's a very pointed reminder to the Chinese of their arsenal.
China's navy and air force at this period can only go places near to the coast. The PLA-N of 1993 isn't the ocean-going PLA-N of 2020/2021. It was only in the late 1990s when the PLA-N began to be green water at least in response to the 1995-96 Taiwan Strait Crisis.
One thing to note is that the PLA-N did have one Xia-class SSBN, which entered service in August 1983 and was armed with 12 JL-1A SLBMs. A second one was rumored to be lost with all hands in 1985. It also tested first SLBM in 1988 according to the WSJ:
With far-ranging nuclear subs, China is rattling Asia’s balance of power, challenging the U.S. and risking an undersea contest with echoes of Tom Clancy and the Cold War.
www.wsj.com
China launched its first nuclear sub on Mao’s birthday in 1970 and test-fired its first missile from underwater in 1988, although its first boomer never patrolled carrying armed nuclear missiles, U.S. naval officers say.
Ditto for the PLAAF.
John W. Garver, China's Response to the Strategic Defense Initiative, Asian Survey, Vol. 26, No. 11 (Nov., 1986), pp. 1220-1239
www.jstor.org
Maybe a scenario where a Russian Civil War has broken out either after the August 1990 coup or in the wake of the 1993 constitutional crisis culminating in the storming of the Russian White house. This may take the form of Chinese intervention on one of the sides in a Russian Civil War or simply an attempt to take advantage of the situation by seizing some of Beijing's territorial claims in Siberia or Mongolia. Otherwise, a Sino-Russian war in the 1990s seems unlikely. In a Russian Civil War situation, I think China would be going for a limited territorial conquest, hence a limited border clash is a probable scenario.
Then have Vlad Zhirinovksy take over. Since he is a nationalist and racist, he may try to rally Russian nationalism of a potential invasion of the Far East by the Chinese. The 1990s was the period where Chinese migration to the Russian Far East increased.