China didn't foist this port on Sri Lanka, and the debt Sri Lanka sought to pay off by working out the HIPG deal had nothing to do with the China Eximbank loans that Sri Lanka received - it was due to some ISBs (International Sovereign Bonds) that were due to mature; nothing to do with China. There's some valid criticisms to be made against China but honestly most of the failures here seem to be caused by financial mismanagement by successive Sri Lankan governments, unfortunately.

As far as the port being used for husbanding Chinese submarines I have no idea what you're talking about but if you've got a source I'd like to read it.

If you're referring to Hambantota Port in Sri Lanka you may want to look into it a bit, because that was not an asset seizure - and never could be as it wasn't part of the terms of the loan.

Hambantota was conceived as a way to shore up electoral support for the then Prime Minister. Columbo Port manages quite nicely; there was no pressing need for a second port. The Chinese failed to understand this as the concept of needing to bribe voters is unfamiliar to them. Funny, that.

Hambantota Port is now owned by HIPG, a company that consists of 85% shareholder CM Ports (a Chinese company), and 15% Sri Lanka Port Authority (a Sri Lankan government-owned enterprise). Now, an 85/15 split doesn't sound like equity, but the terms of the agreement allow for Sri Lanka to increase it's shareholding, provided they can pay for it. It's not a fantastic deal for Sri Lanka but it did allow them to avoid defaulting on the loan. The lesson for both China and Sri Lanka is that investing in white elephants is bad business. HIPG have continued to develop Hambantota Port so there's an outside chance it may be profitable one day.

I can dig up the white paper analysis written by Sri Lankan academics (unaffiliated with either the Chinese or Sri Lankan governments) if you're interested in the details.

Edit: Found the briefing paper. It's 33 pages but you can skip to the summary on page 32.

The debt trap accusation is bullshit. There are problems with the way China goes about making loans, but they are mostly to do with failing to appropriately assess risk and lack of transparency.

The US and the EU have become unnerved by how successfully China has managed to become friendly with countries in Africa and Central and South America, so they are just flinging shit.

Vietnam invaded Cambodia in 1978

Parts are definitely BYD Auto, but BasiGo funding appears to be a mix of Silicon Valley, Japan, and some African VCs. Where are you getting it's from China?