Peru's move, announced by its foreign ministry, came as Ecuador pushed on with building the new four-meter high barrier along of the western side of its southern city of Huaquillas.
The wall would physically separate the city from Peru's town of Aguas Verdes, lying just across a river, despite Peru's repeated demands that the work immediately stop.
The row has revived tensions between the two South American countries.
In 1995, they fought for three months -- the so-called Cenepa war broke out over a disputed jungle area elsewhere along their 1,500-kilometer frontier.
The issue of border walls has become especially sensitive in Latin America as US President Donald Trump has promised to build a barrier along the entire southern edge of his country, to prevent undocumented immigrants from crossing over from Mexico.
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