Request: European company that counters military signal interference

Russia is known for successfully deploying signal interference. It is becoming a critical capability, with insiders reporting that Russia is training its soldiers to use offline communication methods (like flag waving).

Examples:

Spouses of Dutch fighter pilots deployed in the Baltic states reportedly received harassing phone calls from callers with Russian accents in 2019.

Norway said it proved Russian GPS interference during NATO exercises in 2019.

With Russia amassing troops near Ukraine, the neighbouring countries are on edge. The rest of Europe realises that an army isn't a nice-to-have.

Thesis: Europe is already boosting military spending, and with Russia being the main concern, hardening communications is presumably high on the priority list. Whether for a cold cyber war or, much less likely, a hot war.

I am looking for a publicly-traded company that specialises in military IT hardware to counter such threats. Preferably in Europe as, while boosting spending, European countries will prefer European companies.

Currently, I am looking at the Swedish MilDef that IPO'd in the summer of last year. I cannot, however, find any indication that their tech is geared towards combating malicious signal interference.

If anyone has any feedback on the thesis, or MilDef or can suggest another company, please do.