MOSCOW, May 15 (RIA Novosti) - Russia's proposals for a new European security treaty are not aimed against NATO, Russian President Dmitry Medvedev said.

"A new document should be drafted to ensure security in Europe and it should not be aimed against NATO," Medvedev said in an interview with Rossiya TV channel to be aired on Saturday.

The president said the existing set of European security institutions was created in the 1970s and has become obsolete.

"Unfortunately, security in Europe is not improving... NATO is becoming larger, while security is being split into fragments," Medvedev said.

"We cannot accept this approach [NATO expansion], and we will react to it," he added.

Medvedev said an efficient mechanism of European security should involve all supranational organizations on the continent, such as NATO, the European Union, the post-Soviet Commonwealth of Independent States (CIS) and the Collective Security Treaty Organization (CSTO).

"We are simply striving for a new level of security for our country, for our people, considering the hard history lessons of the 20th century," the president said.

Medvedev proposed the idea of a new European security treaty in Berlin last June, saying it should include peaceful conflict prevention and settlement arrangements, confidence building measures, and arms control mechanisms.