Does this mean that Russia is having difficulties meeting its committments?  They certainly know the terms of their agreements.  Is there some underlying problem that is not being addressed?
I dont think supply is an issue for Russia (largest gas reserves in the world). What we are seeing is Russia flexing her muscles, Russia's power will only grow given time. If anything good comes out of this it might help move the EU faster towards green and sustainable policy (Which i have hope will really begin to gather pace soon).

Also bare in mind Russia is essentially a European country and Europe is its largest and richest customer. Russia might be behaving badly but it knows where its home really is. I would much rather have a large producer like Russia behaving a little badly but sitting on my backdoor when PO hits. Than be in the US which has fair less options when it comes to gas.