No need to be rude. Your question was not specific. NATO knew that Russia was concerned about NATO expansion, they did it anyway. Many saw this coming:

Even that first stage provoked Russian opposition and anger. In her memoir, Madeleine Albright, Clinton’s secretary of state, concedes that “[Russian president Boris] Yeltsin and his countrymen were strongly opposed to enlargement, seeing it as a strategy for exploiting their vulnerability and moving Europe’s dividing line to the east, leaving them isolated.” Source

Per the article, “Vladimir Putin bears primary responsibility for this latest development, but Nato’s arrogant, tone‐​deaf policy toward Russia over the past quarter‐​century deserves a large share as well.”