It could also help speed the adoption of a global agreement amongst airlines to reduce emissions via the U.N.

FORBES: Democrats, Republicans Agree U.S. Airlines Should Not Be Subject To EU Carbon Tax

But it has been complicated by a bilateral agreement on adoption.

BBC: US adoptions of Russian children: Some to go ahead

It added that the growth of the internet and adoption of mobile phones meant the existing agreement - signed in 1998 - needed to be updated.

BBC: Google attacks UN's internet treaty conference

Mr Peskov said on Thursday that the agreement between Russia and the US on adoption regulations "remains in effect" and, under its terms, must do so until January 2014.

BBC: US adoptions of Russian children: Some to go ahead