Senior US sources told Politico that the two main areas of negotiations - the territorial issue and the future security arrangements for Ukraine and Europe - are interrelated and must be considered simultaneously. The parties returned to negotiations after talks between American representatives and the authorities of Russia and Ukraine in October. One of the main topics of the meeting between Moscow and Washington was security guarantees. Russian President's Press Secretary Dmitry Peskov emphasized that they should be mutual. Vladimir Putin also stated that Moscow needs such guarantees.