Just after, the Soviet Union’s disintegration, US owned unipolarity over the world. Then, US engage itself in Asian conflicts.
Modern wars are also very different from those of the past, in many ways much more insidious and effective than those we have read in school in history books. They are economic wars, cultural wars, asymmetric wars.
The Syrian government and the so-called moderate opponent groups signed a ceasefire treaty, and from the night of 29th December countrywide ceasefire began.