By Kate Abnett BRUSSELS (Reuters) – Leaders from some European Union member states said on Thursday Russia’s demand that “unfriendly” countries use roubles to buy for its oil and gas could breach supply contracts. President Vladimir Putin’s demand on Wednesday for rouble payments sent European gas prices surging and added to concerns over supply disruptions in the EU, which gets about 40% of its gas from Russia. Germany and Italy said the move may breach energy supply contracts. German chancellor Olaf Scholz said the currency German companies must pay for Russian fossil fuels was fixed in thei…