British transport secretary Grant Shapps has confirmed that a private jet had effectively been impounded in England, at Farnborough Airport in Hampshire.
He told BBC Breakfast that Russian airlines and private jets had already been banned from the UK.
"However there were potential loopholes and I also wanted to make the issue a criminal one, so last night I also signed a law which closes off some of those loopholes to do with trying to work out the ownership of some of these aircraft.
"There is one such aircraft on the ground at Farnborough that I have essentially impounded whilst we carry out further investigations, for the last few days.
"It's very important that we have the laws available to enable that to happen."