The act of promoting or curating user submitted data makes the company strictly liable for any damages done by the content.
I assume you don't mean simply providing the platform for the content to be hosted, in that case I agree this would definetly help.
The deliberate spreading of harmful false information makes the hosting company liable for damages.
This one is damn near impossible to enforce for the sole reason of the word "deliberate", the issue is that I would not support such a law without that part.
They were never given security guarantees, they were given security assurances, which is kind of the issue that led to this. Granted all geopolitics is down to the whims of leaders upholding agreements, but on paper a security guarantee is near automatic cobeligeration with the defending party while a security assurance is in no way as heavy handed. I would say that the Ukrainian goal is to have an agreement that will give them dependable allies in a future conflict.