Germany has said it has triggered the early warning level for gas supplies amid concerns that Russia could cut off supplies unless it is paid in roubles. Germany's Economy Minister Robert Habeck who is also the Energy Minister and Vice-chancellor today said that the measure is a precautionary one as there have been several comments from the Russian side that if the payments are not paid in rubles the supplies will be stopped.  <br />''<br />''The Minister said country's gas storage is currently filled to about 25 percent capacity. Western nations have rejected the Russian demand for rouble payments, arguing it would undermine the sanctions imposed against Moscow over the Ukraine crisis.<br />''<br />''<br />