Haven't had much time today but the following looks to be the most important for the EU citizen. A roundup over the nature and amount of trade and banking activity with Ukraine in every country involved would be more than welcome as well as a response to Russia's remarks and demands, what can be done, when, for how much with a conclusion covering the risks and rewards of addressing the imbalances the letter refers to. The letter was addressed to 18 head of state  Monrovia, Romania, Turkey, Hungary, Slovakia, Slovenia, Macedonia, Czech Republic, Poland, France, Germany, Croatia, Bosnia and Herzegovina, Greece, Serbia, Bulgaria, Austria and Italy.
Was wondering what are the numbers you have by member states?
In this manner, during the past four years Russia has been subsidizing Ukraine’s economy by onffering slashed natural gas prices worth 35.4 billion US dollars.  In addition, in December 2013, Russia granted Ukraine a loan of 3 billion US dollars. These very significant sums were directed towards maintaining the stability and creditability of the Ukrainian economy and preservation of jobs. No other country provided such support except Russia.

What about the European partners? Instead of offering Ukraine real support, there is talk about a declaration of intent. There are only promises that are not backed up by any real actions. The European Union is using Ukraine’s economy as a source of raw foodstuffs, metal and mineral resources, and at the same time, as a market for selling its highly-processed ready-made commodities (machine engineering and chemicals), thereby creating a deficit in Ukraine’s trade balance amounting to more than 10 billion US dollars. This comes to almost two-thirds of Ukraine’s overall deficit for 2013.

To a large extent, the crisis in Ukraine’s economy has been precipitated by the unbalanced trade with the EU member states, and this, in turn has had a sharply negative impact on Ukraine’s fulfillment of its contractual obligations to pay for deliveries of natural gas supplied by Russia. Gazprom has no intentions except for those stipulated in the 2009 contract, nor does it plan to set any additional conditions. This also concerns the contractual price for natural gas, which is calculated in strict accordance with the agreed formula. However, Russia cannot and should not unilaterally bear the burden of supporting Ukraine’s economy by way of providing discounts and forgiving debts, and in fact, using these subsidies to cover Ukraine’s deficit in its trade with the EU member states.../...
You will find the letter here http://en.ria.ru/russia/20140410/189149133/Putin-Warns-of-Ukrainian-Default-Urges-Talks.html