http://news.bbc.co.uk/1/hi/world/europe/7812860.stm
Turkey said all its gas supplies via Ukraine had been cut. Romania reported a 75% reduction. Bulgaria, Greece and Macedonia are also seeing shortfalls.
The Russian energy giant Gazprom says Ukraine has shut down three of the four pipelines for EU-bound Russian gas.
The European Commission says the supply cut is "completely unacceptable".
The EU depends on Russia for about a quarter of its total gas supplies, some 80% of which is pumped through Ukraine.
What are your views on this - have Russia the right to do this, whether it be a financial or a moral level?
How do you think this can be resolved?
Should other countires be affected because of the actions of just one or two?
Its crazy how one country can bottleneck gas supplies to so many people. The EU should take action against Gazprom.