MOSCOW. July 3 (Interfax) - Attempts to replace international law with the national legislation of one state are unacceptable, Russia's First Deputy Prime Minister Dmitry Medvedev said in yet another thinly veiled jab at the U.S.

Lawyers and politicians must perfect the norms of international law, Medvedev said at an international conference marking 50 years of the Russian International Law Association and 100 years of the Second Peace Conference in The Hague.

Some countries "have a very powerful conflict potential that can breed civil war," he told the international conference.

"Moves have been regularly made, especially of late, to do away with the current system of international law," Medvedev said.

Some states "have been obviously trying to replace international law with their national laws and create a system of global law resting on national law, on the legislation of one state," he said.

"Clearly enough, these attempts are counterproductive and are throwing us 100 years back," Medvedev said.

One of the main tasks of the contemporary international community, primarily lawyers and politicians, is to improve international humanitarian and criminal norms, "including rules for treating prisoners, the sick and injured, civilians, and humanitarian values," Medvedev said.

The Second Hague Peace Conference held at Russia's initiative in 1907 created the basis for the modern world order.

Legal norms shaped at the Second Hague Conference continue to define the nature of international relations in the 21st century as well, he said.

Today Russia "has resolutely and consistently advocated rigorous adherence to the norms and rules," Medvedev said.

"The creation of a just and really legal world order is one of the main directions of our foreign policy," he said.