Regarding European languages one can never go wrong with the Assimil series so I’d check that first (it’s available on annas-archive as a zip archive with the audio files included). You can make a solid base with just Assimil, but you can also include anki decks or grammar drills corresponding to your current level to progress at a brisk pace.

NATO is not a defense alliance, it’s a subterfuge for imperialism, they are unified imperialists if anything — I wish people in the left would realize this. It’s concerning how many show support for this organ of bourgeois control. There are a multitude of such examples as shown in the meme where they shown their true colors.