The Russian central bank has banned short-selling amid a 50% stock-market plunge as Russia invades Ukraine

• Russia's central bank implemented a short-selling ban on Thursday after the country's stock market plunged.
• The MOEX Russia index crashed as much as 50% and erased $259 billion in market value after Russia invaded Ukraine.
• The ban is in place "in order to protect the rights and legitimate interests of investors in the financial markets."

A 50% crash in Russia's stock market on Thursday after $4 led the country's central bank to implement a ban on short-selling.

Short-selling allows investors to profit on the decline of a stock, and the practice can exacerbate an ongoing sell-off. Russia's ban represents an attempt to stem the decline in the country's stock market.

"In connection with the current situation in the financial market and in order to protect the rights and legitimate interests of investors in the financial markets, reduce risks and limit excessive volatility, the Bank of Russia ordered brokers to suspend short sales on exchange and over-the-counter market," $4

Russia's MOEX stock market index erased $4 on Thursday, and the index was already down about 20% leading up to Thursday's plunge. During the latest sell-off, the index tumbled as much as 61% from its 52-week high.

"Russian markets are in meltdown, chiefly on sanctions fears and the country effectively being ousted from the international financial order," $4, chief analyst at Markets.com.

Russia's ruble currency also plummeted to a record low on Thursday as elevated sanctions against Moscow appear likely. Russia $4 threatening to kill innocent civilians and forcing many to flee the country.