(Reuters:) BP, the energy major (NYSE:), opened a new front for the West’s effort to isolate Russia’s economy. Its decision to withdraw from the oil-rich country was the most aggressive reaction by a company since the invasion of Ukraine.

The West’s allies are intensifying their efforts to sanction Russia by imposing new sanctions on the country. These include closing down Russia’s airspace and cutting off some banks from the SWIFT network. They also limit Moscow’s ability of deploying its $630 billion foreign reserve. This is expected to severely damage the nation’s economy and financial markets.

BP is the largest foreign investor in Russia. It announced that it would be selling its share in Rosneft, Russia’s state-owned oil company, at a price of $25 billion. This will reduce Russia’s oil and gas resources by half.

This sudden move by the British firm puts the spotlight upon other Western companies with Russian operations amid increasing pressure from Western governments to tighten financial controls on Moscow. After the largest attack on an European country since World War Two, the British company launched the most severe economic assault against it.

On Sunday, the European Union’s chief of internal markets told Alphabet’s chief executives (NASDAQ:) as well its YouTube unit that it would ban war propaganda users in a video conference. This was part of efforts to stop disinformation about Ukraine.

Alphabet’s Google already forbids Russia’s state media outlet RT from receiving ads money on its websites, apps, and YouTube videos. This is similar to a Facebook move (NASDAQ:).

A NO-GOZONE

Officials in the United States say that Canada, Europe and Canada took an unusual step to block Russian airspace.

U.S.-based United Parcel FedEx Corp (NYSE 🙂 and Service Inc (NYSE :), the two largest logistic companies in the world, announced that they will not be delivering to Russia or Ukraine.

After the decision to disconnect some Russian banks from SWIFT (a secure messaging network used worldwide for billions of transactions), large parts of Russia’s economy will no longer be accessible by Western financial institutions and banks.

According to its president, even neutral Switzerland would likely join the European Union when it sanctions Russia and freezes Russian assets.

Russians queuing up at ATMs this weekend in fear that new sanctions would cause cash shortages, and thus disrupt payment.

Technology companies were also affected by Dell Technologies’ (NYSE:) Inc decision to suspend sales in Russia and Ukraine following U.S. bans on the export of hi-tech equipment, computers and sensors.