You won't be so matter of fact if its a couple of Tornado crews being beheaded as war criminals - which they will be if there is no U.N. resolution.
International law is by no means clear that the use of military force must always be authorised by the UN Security Council. There is a developing legal framework for military intervention on humanitarian grounds. Known as the Responsibility to Protect, or R2P, it was born out of the humanitarian disasters of the 1990s in Kosovo and Rwanda.
You also might not be so logical if it is your granny who freezes to death without Russian gas next winter.
Melodramatic and highly unlikely: Russia's economy is highly dependent on gas exports to Europe, so withholding those exports for any sustained period would start to hurt the Russian economy. Also, 93.5% of the energy consumed in Europe is covered by sources other than Russian gas – and natural gas, unlike oil, faces direct competition from other fuels and technologies.
Transport modes and routes for gas have also diversified. Until the early 2000s, most of Europe’s imports came via pipelines. But over the past decade, Europe has become a major customer in the rapidly growing market for liquefied natural gas (LNG), which is transported by sea.