Cast your mind back five weeks ago to when the Ukraine invasion began.

Alongside the horror and revulsion on the ground in that country, there was immediate panic in the Western corporate world.

Partly this was because business leaders hadn't really expected a war to take place.

But also because it left those that were doing business in or with Russia in a very tricky situation, both ethically and financially as sanctions began to be imposed.

On the one hand, many of these firms had invested substantial sums of money in Russia. Some were deriving significant portions of their global revenue from there.

They also had staff on the ground there who were dependent on them as employers and to whom they owed a duty of care no matter what their leader had decided to do.

In some cases, they were also providing essential products and services, including food and healthcare, upon which the Russian population were depending.

But on the other hand, an almost instant ethical pressure started to come on them from investors, shareholders, other customers and from Governments to pull back.

The argument increasingly being proffered was that anything that fed the Russian economy was in turn feeding Putin's war machine.

So there quickly emerged a huge and rapidly expanding reputational risk for firms continuing to trade within Russia.

Some also don't seem much prospect of Russia being a place they can do business again for a very long time for a multitude of reasons, and so exiting now, even at a cost, makes sense.

What we've seen since, therefore, has been large numbers of companies either severing their Russian links entirely and closing down operations.

Or at very least they have suspended their activities there indefinitely or reduced them to levels that can be justified on essential service grounds.

Included in the long roll call are global names like BP and Shell, Carlsberg, PwC, Spotify and many more who are withdrawing completely

While others like Apple, Ikea and McDonald's have for the moment suspended all sales.

So what about the big Irish companies - have any of those withdrawn?

Yes, many have but not all.

Building materials giant CRH was among the first big names with Russian operations to pull the plug.

It announced at the start of last month that it would be ceasing its activities there, where it has been operating since 1998, albeit at a very small scale.

It supplies the Russian building materials market through its Finnish based operating company Rudus.

Rudus operates a concrete panel production plant servicing the city of St Petersburg.

The company also operates a number of Russian ready mixed concrete plants through a joint venture with another large Finnish concrete producer.

While Smurfit Kappa, the large Irish multinational packaging firm announced on Friday that it too would be exiting Russia and has already suspended support for its operations there, including imports and exports and funding.

It has four operations in Moscow and St Petersburg which it uses for manufacturing, making it among the largest international corrugated packaging producers in Russia.

It employs 800 people there, although overall Russia accounts for less than 1% of forecasted sales.

So two high-profile exits then, although in the case of Smurfit Kappa it's taken longer than many to reach that decision.

What then of those Irish firms that haven't pulled out?

Yes, there are still a number of large well-known Irish firms operating in Russia.

Food ingredients company Kerry Group has been there since 2006, opened a research and development operation in Moscow in 2014 and a manufacturing facility in the city in 2018.

In total it employs 250 people between Russia and its plant in Belarus, both of which are highly interconnected.

The company told RTÉ's This Week programme that as a producer of food, beverage and pharma solutions, it plays a critical role in the food chain and recognises this responsibility across all its markets.

It therefore has decided to continue supplying food, beverage and pharmaceutical products that are required to meet the needs of the local population.

But it says it has scaled back its operations in Russia, including pausing capital investment, stopping all exports and suspending the production of branded products

It also claims it does not expect to make a profit or pay any related tax in Russia, but if any profit is made, it will be donated to humanitarian relief efforts.

The firm has also taken measures to ensure the safety and protection of staff in Ukraine and their families.

Like many companies, it has also given financial support to a charity assisting the victims of the war.

Through a global partnership with the World Food Programme, it has made an additional donation of €250,000 to support the on-the-ground relief work of getting food supplies into Ukraine.

Separately, building materials company Kingspan also has two production facilities in Gatchina near St Petersburg and Stavropol in southeast Russia.

It is saying very little about its future plans.

But in a statement to RTÉ's This Week, it said that it is monitoring the situation closely and that it is determined to reach the right decision in the near future on its Russian business, which makes up less than 1% of its global operations.

It also says the situation is complex, and the welfare and safety of staff is its priority.

It too is making charitable donations to causes assisting with the fallout and has donated $750,000 to UNICEF for the set up of five Blue Dot Centres to assist refugees on the border.

Are there any other Irish firms still there?

Export support agency, Enterprise Ireland (EI), has an office in Moscow which has suspended activity and staff have left the country.

EI says that while it is currently supporting impacted companies who export to Russia, Ukraine and the wider region, its normal trade promotion activities in Russia are currently suspended.

Before the war broke out it supported 165 companies trading with Russia in sectors like fintech, ICT, lifesciences and education.

Most of those would be smaller exporting Irish businesses.

Today though it can't put exact figures on what all those companies are doing.

But it did say that through its engagement with these exporters it has found that the majority are either ceasing or suspending their trading activity in Russia for the foreseeable future.

Others, it said, are in the process of reviewing their operations.

So the reality is probably that right now there is not a lot of business being done by Irish firms in Russia and that's unlikely to change any time soon.