Russia and U.S. in tit for tat at United Nations over Sudan, South Sudan

UNITED NATIONS (Reuters) - The United States and Russia traded swipes at the U.N. Security Council on Tuesday over proposed statements about peace progress in Sudan and South Sudan, with Russia's U.N. envoy accusing the U.S. ambassador of bizarre behaviour and making outlandish claims.

It was the latest in a series of tense public exchanges between Moscow and Washington, whose relations have become increasingly frosty in recent months because of disagreements over how to deal with Syria and human rights in Russia.