This invasion is a well planned invasion and Putin and his government have calculated all possible scenarios and possible results of western countries’ interferences! They already knew what prices that they would pay for this invasion!
They also knew the weakness of western countries. The German and Italy are heavily relying on Russian natural gas and gasoline resources! UK was busy on coping with covid19 and Brexit! US has a weak president who will not get into any wars for now. Australia is too busy on fighting with communist China and so on.
India has its own problems and will not have mood to interrupt the international affairs and also its military is heavily relying on Russian weapon supply and maintenance!
Communist China is the complicity of Russian invasion and it will stand with Putin!
As a result, Putin is not afraid of international sanctions! He has prepared for it ages ago!
Without NATO’s interference and help, Ukraine can not stand for long!
Acting now or we will lose a democracy country to a dictatorship! After the fall of Ukraine, which country will be the next?