nato leaders have called russia's invasion of ukraine a terrible strategic mistake, for which it will pay a severe political and economic cost for years to come. nato has been holding an extraordinary summit— which also included — finland, sweden and the eu — to discuss the latest developments. turkey told the meeting that the alliance should have responded to the invasion more decisively. in america, president biden says he's targetting russia's largest banks and state—owned companies, cutting them off from western financial markets, and freezing trillions of dollars in assets. our diplomatic correspondent, james landale reports on the global response, to the crisis here. this is what the defence of kyiv looks like. soldiers with guns and armoured vehicles, ready to take on the might of russian tanks and warplanes. little wonder there is a debate about what more the west can do to help. but these american fighter jets will not be coming to their aid. they arrived in romania today as part of nato's decision to beef up its presence in member states close to russia. so as well these british forces, arriving in the baltic states of estonia.