According to the article I linked to, Iskanders have limited reach. I am not sure about Iskanders in Belarus but those in Kaliningrad can (again, according to the article) reach Berlin and Warsaw, but not London, Paris and Rome. Wheras the Kinzhal can reach London, Paris and Rome.
Various reasons. Norway for instance have very few troops, and we share a border with Russia. We cannot send more than what we already have sent without severely compromising our own security. The other NATO countries are aware, and are not asking Norway to send more. Denmark and the Netherlands have sent some minor additional contributions already. France, Germany, Spain and Italy should be able to send more. And Turkey of course. For various political reasons they are hesitant. However, Germany have signaled they might send another 350 troops. No wonder Russia is so afraid of NATO, it's aggressive posture right now must seem very scary to Russia.
NATO has tried many times to start a dialog with Russia, and has also tried to implement and abide to various agreements and protocols. As discussed previously, Russia has "responded" by turning the Russian representation at NATO HQ into a spy ring, breaking various agreements, killing opponents living in NATO countries, starting troll factories aiming to weaking Western democracies (note: not limited to NATO countries!), launching cyber-attacks against various Western countries (note: not limited to NATO countries) and invading some neighbours (so far limited to non-NATO countries).
No wonder Eastern European countries want to join NATO! Ukraine was not really interested in joining NATO until they were invaded by Russia.
Non-NATO countries Finland and Sweden are observing what is happening, they notice the troll factories and cyber attacks from Russia against their own democracies, and they also notice that Russia is threatening them with military attacks including nuclear, if they decide to enter NATO. However when looking at what happened to Ukraine, and how Russia trashed the Budapest memorandum, more and more people in Sweden and Finland also want to join NATO. This increased interest in Sweden and Finland of joining NATO is not related to any pressure from NATO, it is simply a reaction to the Russian behavior.