Ukraine's ambassador to the United Nations in Geneva has said Russia may be preparing a further military incursion into Ukrainian territory, AFP reports.

Yuriy Klymenko told a briefing on the human rights situation in Ukraine today that "there are indications that Russia is on its way to unleash a full-blown military intervention in Ukraine's east and south."

Klymenko called Russia's annexation of Crimea a farce, as well as unlawful and illegitimate, and called for Russia to negotiate.

He described Russia's occupation of Crimea as aggression and an illegal land grab and said human rights had seriously worsened there since Russia took control.

In response, a Russian diplomat read out a prepared statement, justifying Russia's actions as legal under Russian, Ukrainian, and international law.