The only place you're likely to get a Russian extension lead is in Russia. The only place you likely to get a Brazilian . . . (Oh, I think you've got the idea!).
Apart from the difficulty in getting hold of such leads, I think that you're going the wrong way about things. If you want to plug a number of UK appliances into a Russian / Brazilian / Thai socket, it's far simpler to take a UK extension lead with you. The only extra thing you need is a cheap international plug adapter (which should fit the sockets in all three countries).
Simply plug the adapter into the foreign socket and plug your multi-socket, UK extension lead into it. You can then plug your UK appliances into it, without the need for further adapters or having to change any plugs.
Some plug adapters have a maximum current rating, so you shouldn't plug too many high-current appliances (such as travel irons or hair straighteners) into the extension lead at one time but, as long as you're careful, there shouldn't be any problems. (You can plug lots of low-current devices, such as mobile phone chargers, into the extension lead without any worries at all).
The only other thing you need to consider is the voltage of each supply. The UK uses 230V. Thailand and Russia both use 220V, which is so close as to make no difference. In Brazil, the supply might be either 110V or 220V. If it's 110V, many UK appliances won't work. Others might work with reduced efficiency.
http://www.kropla.com/electric2.htm
Chris