JPMorgan thinks the current suite of economic sanctions against Russia could shrink its economy by 20% quarter-on-quarter and by 3.5% on the year. JPM also admits that these estimates may badly overestimate the downward movement. Also,

In conjunction and cooperation with the European Union, Japan, the UK, Canada, and others, the United States has effectively frozen financial transactions of Russian central bank assets held by Americans, a senior administration official told reporters during a briefing on Monday.
The intended effect is to cripple the Russian economy and use up the country’s “rainy day fund” as its currency, the ruble, plummets in value, the official said.

However, these sanctions carefully and deliberately leave untouched the bulk of Russia’s income—its foreign sales of oil and natural gas, with Russia our second largest source of imported oil as of last August.

The European Commission, France, Germany, Italy, United Kingdom, Canada, and the United States issued a joint statement on Saturday that “selected” Russian banks would be removed from the SWIFT financial system.

Except for the Central Bank of Russia, its central bank, and those oil and gas transactions.

Commerce Department unveiled…export controls [that] include semiconductors, computers, telecommunications, information security equipment, lasers and sensors. In addition, BIS’s [Bank of International Settlement, the bank of nations’ central banks] rule imposes stringent controls on 49 Russian military end users, which have been added to its entity list.
The European Union, Japan, Australia, United Kingdom, Canada and New Zealand announced that they would implement “substantially similar restrictions.”

Export controls aren’t export bans….

Some ladies from the South might say, “That’s nice,” regarding these economic moves, or even “Bless their hearts” regarding the persons making them.

However.

How many divisions, much less bullets, do those sanctions provide Ukraine in the here and now, as women and children are butchered by Putin’s barbarians as his invading horde begins increasingly to target apartment buildings and residential neighborhoods? How many divisions do those sanctions cause Putin to withdraw from Ukraine as his military prepares a Stalingrad-esque starvation siege of Kyiv or a Grozny-esque destruction of it, and begins its Grozny-esque burning of Kharkiv to the ground?

The economic sanctions actually are a good start, and they should continue in effect until Putin, his oligarch syndicate cronies, their deputies and assistants and lower down made men, and the members of the Duma are long gone from the Russian government and economy. But those sanctions are wholly inadequate alone. Ukraine will lie in ashes, its survivors existing in Russian serfdom, long before those sanctions take material effect.

Ukraine needs lethal weapons—antitank, antiaircraft, antimissile, along with anti-infantry and small arms—and those lethal weapons need to include, also, offensive weapons with which to drive Putin’s barbaric military out of Ukraine altogether. Ukraine needs tons of ammunition for those weapons and training in the use of many of them.

Ukraine needs food and medical supplies for Kyiv, Kharkiv, Odessa, Kherson, Mariupol, and on and on.