Several Central European countries have asked the US to provide them with natural gas.

The ambassadors of Poland, Hungary, the Czech Republic and Slovakia in Washington sent joint letters to the US Congress asking the lawmakers to loosen the liquefied natural gas (LNG) export limits and help them reduce their dependence on Russia's Gazprom, reports the Financial Times.

The Ukraine crisis and the Gazprom hints that it might cut the deliveries for Europe, passing through Ukraine, have revived the concerns that there might be another gas crisis, similar to the one in the winter of 2009, when Russian gas deliveries stopped for two weeks.

The US does not currently sell any LNG to Europe and Congress has no direct control over export approvals. That lies in the hands of the energy department.

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