When you do lots of deficit spending, the sustainable way is to use it to rebuild your country and strengthen it. Sending your most capable young men into Ukraine or in weapons factories, making expensive stuff that does nothing but explode, or stuffing propaganda money up people's assholes to puppeteer them, does little for your country except extract everything of value and leave most of the country with nothing.

I'm no fan of China, but at least using large amounts of government funds to build needlessly fancy bridges, buildings, tunnels, railroads and highways brings prosperity and resilience to vast swaths of your country that you might be able to use later.