The gas war between Russia and the West

Natural gas has emerged as a weapon of war between Russia and Europe since Moscow's February 24 invasion of Ukraine.

Here is how the stand-off developed:

On February 22, 2022, German Chancellor Olaf Scholz says he is suspending the Nord Stream 2 pipeline project with Russia in response to Moscow's recognition of two breakaway regions in Ukraine. The project has long been a source of tension with Berlin's allies in the United States and Europe, who worry it would increase Germany's energy dependence on Russia. Ukraine also fears it will lose revenues from gas transit if Nord Stream 2, which would deliver Russian gas to Germany via the Baltic Sea, goes ahead.

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On February 24, Russia invades Ukraine. Gas and oil prices soar on fears of possible cuts in supplies.

On March 2, the European Union cuts seven Russian banks off from the SWIFT banking transfer system.

But it spares two major lenders with strong ties to the energy sector, reflecting the dependence of several EU states on Russian gas.

On March 8, President Joe Biden bans US imports of Russian gas and oil. The EU says it will cut its imports of Russian gas by two-thirds this year and Britain says it will phase out its Russian energy imports by the end of 2022.

On March 23, Russian President Vladimir Putin bans European gas customers from paying their bills in dollars and euros, in response to the freezing of some $300 billion in currency reserves held by Russia overseas.

He announces that Moscow will now only accept payment in rubles from "unfriendly" countries, including EU nations.

The European Commission warns EU members that by paying in rubles they would be violating international sanctions against Moscow.

Washington agrees to provide Europe with an extra 15 billion cubic metres of liquefied natural gas this year.

On April 27, Russian giant Gazprom cuts off gas supplies to Bulgaria and Poland, in a move European Commission chief Ursula von der Leyen describes as "blackmail".

She says the two EU and NATO members are now receiving gas from their EU neighbours.

On May 21, Russia cuts gas to neighbouring Finland, which has refused to pay in rubles and angered Moscow by asking to join NATO.

The Netherlands and Denmark are also cut off after refusing to pay in rubles.

On May 30, EU leaders agree to stop most Russian oil imports by the end of the year but put off a ban on Russian gas.

In mid-June, Gazprom drastically cuts daily gas supplies to Germany via the Nord Stream pipeline, causing prices to soar. Claiming a technical problem, Gazprom reduces deliveries by several notches, as EU leaders prepare to give Ukraine candidate status.

On June 23, Germany moves closer to rationing gas, raising its supplies alert level to the second of three stages.

On July 11, Gazprom begins 10 days of routine maintenance on its Nord Stream 1 pipeline, resulting in gas cuts in Europe.

A week later, the EU and Azerbaijan sign an agreement to double gas imports from the energy-rich Caspian nation to Europe.

The 27-nation bloc has also turned to oil-rich countries such as Qatar, Norway and Algeria to make up for its energy shortfall.

On July 20, the European Commission urges EU states to reduce demand for natural gas by 15 per cent over the coming months to secure winter stocks.

On July 25, Gazprom says it will further cut the supply to about 20 per cent of the pipeline's capacity due to the "technical condition" of one of the turbines.

The German government says there is "no technical reason" for the move.

On July 30, Gazprom suspends gas supplies to EU and NATO member Latvia, citing violations of the conditions of purchase.