There're countless studies conducted during the Ukraine-Russia war pointing out what sectors to hit with full export ban to grind Russian military capability to a halt (e.g Austrian GFM manufacturing equipment for artillery barrels production). But this is very politicized discussion. Obviously companies will want to protect their interests and politicians prefer to make strong and visible statements in place of the working ones (like, freezing Russian assets outside of Russia does very little damage to Russia itself right now, compared to, say, decimating their heavy equipment supply chain)

Business is separate from war (see Sweden's metallurgy industry during WW2).

- Europe is still consuming lots of gas that finances Russia's "defense" budget.

- There's also a lot of other business with Russia that is not sanctioned.

- Ukraine does not have enough ammunition.

- There are so called neutral countries that should not be neutral.

The US could stop Taiwan from selling ammunition manufacturing machinery to Russia

> What is left on the table?

Arming Ukraine, tighten sanctions.

The world has been treating Russia with kids gloves while it should be treating it as the drunken nuisance it is.