They look Roma to me.
No doubt about it - They have been running grift since the dawn of time. Ran into that bunch when I sold a sailboat on ebay. They "won" my auction and then tried to sucker me in wiring money to them in England if they sent a "cashier's check" for an amount $500 greater that the sale price. I contacted the London police and they told me that Roma families were pulling that scam all over the world. They actually sent me the bogus check and I turned it in to our police here. They kept trying but I ignored them and eventually sold the boat to real people here.
When I was in Moscow with a team, one of our civilians was looking for tourist stuff to bring home at the Arbat and he was jumped by eight or more Roma kids who pinned his arms and legs while one of them removed his money belt.
I would imagine FJB will be glad to bring more of them here.