That simply hasn't been true for well over 25 years. Conventionally Russia is the weaker of the worlds major powers, they have relied on their nuclear stockpiles as a method to retain survival/continuation of the state.
On paper Russia would struggle against the EU let alone NATO in a conventional war.
The Wests issue is that they are not united. Recently the populations of germany, italy and france polled that a majority would not advocate a war against russia even if russia had invaded a NATO state. IE, they would not support their NATO commitments even if a fellow european nation was invaded.
This is a massive issue, especially when the same poll suggested all the countries populations would expect the US to do the work for them. Europe has lived under someone elses protection for so long they have forgotten that they are responsible for themselves.
I hope this puts into context just how abjectly stupid saying "others will pick up the slack, we don't need to do anything" is.
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Now on actual topic.
http://www.bbc.co.uk/news/uk-politics-33983794
Interesting news in the papers backing choices. Scottish going Corbyn and Mirror going Burnham. I wonder if Scotland could become Labour again if he won?