Russia is using “Not a nice tactic” by refusing to discuss contracts or payment for deliveries of water, so it appears the Ukraine has no better recourse than to deliver water when contracts and payment are forthcoming.
What “gas bill” are you talking about? You perhaps mean the contract which Russia abrogated with an illegal invasion and thereby voided. You know, the contract wherein Russia (1) guaranteed the territorial integrity of the Ukraine and its territory in the Crimea and (2) guaranteed a discounted price for the natural gas deliveries in exchange for (3) a naval base and other bases on Ukrainian territory in the Crimea in limited numbers and for a limited period of time. If that is the “bill” you are talking about, you should already be aware that Russia's invasion of the Ukraine created a state of belligerency or war against the Ukraine, and that belligerency gave the Ukraine the right under international law to suspend and/or void all contracts between the two states pending the end of the belligerency and reestablishment of normal diplomatic relations. All belligerent assets seized are to be administered on behalf of the belligerent power by a trustee, and any war reparations may then be satisfied from the funds resulting from the sale and liquidation of those assets at the end of the war. The Ukraine's war reparations obtainable from Russia include compensation for damages and penalties for the illegal Russian occupation and annexation (alienation) of the Crimea. So, if you want to talk about who owes how much to whom, you have a lot of work left to do to add up all of the war reparations Russia is liable to owe to the Ukraine for the criminal acts against the Ukraine.
I can't get excited about either side here. I just know this is all Obama’s fault.