I find it weird how any discussion about Signal will inevitably have a bunch of people piling on dismissing any criticisms of it. Believing that Signal is perfect has become like a religion at this point. Whatever people might think of Telegram is completely irrelevant when it comes to the question of whether Signal is actually a secure tool or not.
The fact that people working on Signal have direct ties to US intelligence agencies cannot be ignored. No can the fact that Signal is a centralized system based in US. These two things alone should make everybody very concerned.
That seems to be the difference between China and the west in a nutshell. China keeps promoting shared future for humanity and cooperation, while the west keeps trying to create a new cold war where blocs compete against one another.
More plausibly, US has now run through its stocks of weapons sending them to Ukraine, and doesn't have the weapons to send. Framing it as refusing to send the weapons because US all of a sudden developed a conscience is a way to avoid admitting this.