No, not Ukraine. Russia's plans for war against China was leaked. No surprises really, they would need to use battlefield nukes to stop China. There is no good way to get the bulk of Russia's army from the west to the east, any conventional war could only go one way. These plans were from 2008-2014.
Russian Threat Perception and Nuclear Strategy in its Plans for War with China - War on the Rocks
Even as Russian President Vladimir Putin and Chinese General Secretary Xi Jinping a were forming “a new epoch in relations” between their two countries,
warontherocks.com
