China is widely suspected of supplying Russia with equipment and materials to support their war, however no-one has adduced anything concrete to support that theory so far.

The article itself doesn’t cite much in the way of sources or evidence, other than mentioning a report by Molfar, the open source intelligence agency. Molfar has published reports on the same topic in the past, but there hasn’t been anything recently.

If the Telegraph had new information or evidence they would be shouting a lot louder than this. This is most likely them covering up for a quiet day by dredging up some old rumours and repackaging them as news.

Euler’s identity is pretty amazing:

e^iπ + 1 = 0

To quote the Wikipedia page:

Three of the basic arithmetic operations occur exactly once each: addition, multiplication, and exponentiation. The identity also links five fundamental mathematical constants:[6]

The number 0, the additive identity.
The number 1, the multiplicative identity.
The number π (π = 3.1415…), the fundamental circle constant.
The number e (e = 2.718…), also known as Euler’s number, which occurs widely in mathematical analysis.
The number i, the imaginary unit of the complex numbers.

The fact that an equation like that exists at the heart of maths - feels almost like it was left there deliberately.