Ukraine
That's serious bit. In the part which is cut off when a long tweet is displayed here it says:
"We have materials, we have knowledge. "If there is an order, it will take us only a few weeks to get the first bomb," warned a Ukrainian official in charge of arms supplies. According to him, the West should "think less about russia's red lines and much more about our red lines."
I seriously consider the possibility that the fellow who posted that at Twitter might be windy. Or perhaps that an unnamed Ukrainian official is ... .
I doubt they have the materials. Some of those materials need an up and running infrastructure just to maintain having it. Some parts of it are made of materials which have shelf lifes which are independent of the device's life overall. Some parts are liquid, some parts are gas.