America is a good ally for Britain. Britain has a long standing reputation of being involved in world affairs so it is very likely that we will be involved whatever happens.
Putin was granted permission from the Russian parliament to use forces in all of the Ukraine if he wants. He hasn't yet but could well start.
As for Iraq that is a whole different situation. That was for oil and to get rid of a terrorist haven led by tyrant who was attacking allies of the West. The Crimea is not a terrorist haven or attacking Russian allies.
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2,000(around that) civilians killed in 9/11, 100,000 civilians killed in numerous unjustified attacks on Iraq.
Attacking a country over oil is far worse than Russia trying to take control of a country where the majority of people are of Russian ethnic.
However, Iraq is a whole different discussion and opinion base so I am going to avoid that debate.