the Pilot's door is a highly secure thing, since a long time now. I've been on quite a lot of little old things much like Dakotas on short hops in Africa, where the door was held open with a bit of tribal beadwork and if you lingered at the door you were invited in. If you were enthusiatic to see what they've got (nav eqpt)I always found them very happy to show, ask what you've flown and so on.
Aeroflot always had a guy by the cockpit door with a lumpy pistol like a Tokorov, ready to shoot any prospective hijacker.
We got to Latvia. Latvia doesn't border on Ukraine. But it does border on the next country, #4 Russia. Russia is big, so as you'd guess there aren't very many countries left, so not 25.