In to days world ,international relationships between two countries or group of countries or blocks are dependent on mutual trades . More trade means more prosperity .On the other hand countries under sanctions ,where restrictions are imposed by international community on their trades ,suffers very badly . The latest example is of Iran . At one point of time they were struggling to save their economy in spite of being oil rich country . They suffered Foreign Exchange crunch very badly .Russia is also under sanction of western countries and is under pressure.