What laws did they break? Other than illegally occupying the land of a democratically controlled country, and now illegally invading more of the country with military force, none at all.
Russia has now become a Cold War aggressor and must be dealt with as such.
on top of that, there now needs to be an entire global effort by the entire western coalition, to restructure world energy supply. This could happen easily in one year by more domestic production, ramping up subsidies for wind and solar, and ending sanctions on Venuzeulan, and Iranian oil production. Iran is also a large producer natural gas, and a proposed pipeline to Western Europe in the past, could be constructed.
contrary to popular belief, Russias gas is not needed. Simply ending sanctions on Venezuela, and Iran production would immediately cut oil prices putting Russia, and Saudi Arabia in a bad position.