@Peregrina
But threatening someone that you will report them to the Tory Party seems absurd. What will they do? Send someone with their zimmerframe round to beat you up?
I highly doubt that the Conservative Party would want to encourage any close examination of the way it has been funded in recent years.
Be in no doubt that if you are very wealthy in Russia it is because Putin allows you to be so. And you owe him for it.
If you are told to go to the far flung North East and spend more than a billion of your own cash on building schools, roads, shopping centres to level up the region – you do it. And you stay there until you are told you may leave. Otherwise you will at best find yourself facing huge bills for unpaid back taxes (see Yukos).
I suppose if you are told to go and insert yourself into the elite circles of a foreign country then you do that too. Or whatever it is. And let’s be clear-eyed that governments of all stripes DO build contacts and assets in rival capitals. Not many have billions to throw at it though. 
Leaving Russia does not put you beyond Moscow’s reach. See Skripal – poisoned. See Sergei Pugachev – pursued through UK courts. See Russia’s changed approach to tax havens. It’s like the KGB and Hotel California; you can check out but you can never leave.
The Russian state has been turned into a slush fund for the powerful and wealthy. So you might get an unbelievably generous government contract for say PPE – but you are then beholden to the Kremlin. (If they’d had this system in the old CCCP days then I guess you would have been expected to donate to the Party in gratitude. And then maybe you’d be gifted a state asset at knock down price – mineral data extraction facilities and the like. And round and round the money goes.)
This quote from this Irish Times article is a very succinct explanation of how it works:
Borisovich says London’s Russian oligarchs should not be mistaken for conventional, self-made businessmen. “Their riches come from transactions with the Russian government. They either sold something for a fortune to the state of Russia or they bought something for pennies in some sort of privatisation from the state of Russia. Some of them managed to do both, to buy for pennies and sell for fortunes. Some of them never did any of that and they just worked all their life as government officials and somehow in the process became immensely rich,”
There may well be questions to be asked about funding of various political parties in the UK. But to my mind funding accepted from rich Russians when that country is unfriendly and is known to use its billionaires as state actors is just on a whole other level of questionable.
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References/ Further reading:
Putin’s People: How the KGB Took Back Russia and Then Took on the West by Catherine Belton.
(Primer here... www.theguardian.com/books/2020/may/06/putins-people-by-catherine-belton-review-a-groundbreaking-study-that-follows-the-money )
BBC story of Sergei Pugachev once known as Putin’s banker who then fell out of favour. It’s not about whether he’s a goody or a baddy. It’s about not ever being able to outrun the Kremlin.
www.bbc.co.uk/news/stories-52091928
(NB from above BBC article:
“In 2006, Russia passed a law giving its agents the license to kill enemies of the state abroad.
In 2012, wealthy Russian exile and whistleblower, Alexander Perepilichny, dropped dead while out jogging near his mansion in Surrey.
In 2013, Boris Berezovsky, an opponent of President Putin, was found dead at his home in Ascot.
In 2015, a leading Russian opposition politician, Boris Nemtsov, was shot dead in Moscow.
The Russian State was closing in on Sergei Pugachev and in 2015, used British courts to pursue him and the missing $1bn.
…Pugachev's assets were frozen worldwide, and his passports seized.”
Irish Times article www.irishtimes.com/news/world/oligarchs-and-unexplained-wealth-london-s-rich-russians-1.3438072
Open Democracy: Revealed: Electoral Commission’s private concerns about Russian Tory donors
www.opendemocracy.net/en/dark-money-investigations/revealed-electoral-commissions-private-concerns-about-russian-tory-donors/
There have been questions about funding for a while now. This from The Guardian in 2008 : Oligarch's adviser funds Tory www.theguardian.com/politics/2008/oct/25/partyfunding-conservatives
Firtash: Married to the Ukrainian Mob – Foreign Policy Magazine
foreignpolicy.com/2014/03/19/married-to-the-ukrainian-mob/
Voice of America : Russia Tax Haven Laws
www.voanews.com/europe/russia-tightens-tax-screws-super-wealthy
Yukos : en.wikipedia.org/wiki/Yukos
Abramovich Resigns as Governor of Chukotka: www.theguardian.com/world/2008/jul/03/russia2