Western Politicians, except Corbyn and Juncker, have generally backed Theresa May's proposition that a DIPLOMATIC WAR against Putin should be observed after the attempted assassination of Sergei Skripal and his daughter on British Soil !
Alas, none of these high-powered Politicians or Diplomats have proposed any measures which could be taken to curb and restrain Putin. His aims are clear : like a real Dictator he wants to restore the might of Russia and rule Russia like Stalin did !
Russia already has one army helping Syria in the Middle East War and another which occupies parts of Eastern Ukraine. Is it Putin's aim to "grab" the whole of Ukraine and perhaps Syria ? He has already snatched Crimea !
But, Putin and Russia have weaknesses which the West must exploit, to stop more Russian aggression.
The simpliest method seems to be an ECONOMIC TRADE WAR by Western Allies, stopping all imports or exports with Russia. This would quickly destroy the Russian Rouble, but also arouse internal anti-Putin protests.
Putin had a landslide victory in the "Election" last Sunday but only because Opposing Candidates were prevented from participating !