Hydrocarbons play a large role in the Russian economy, as revenue from oil and natural gas production and exports accounts for more than half of Russia's federal budget revenue.
<u>The correct answer is 3. To pass the control of the war to the South Vietnamese. </u>Vietnamese was a plan proposed by Richard M. Nixon and consisted of withdrawing US troops located in Vietnam, to return the fighting to the Vietnamese of the south. Nixon also explained the war to Laos and Cambodia.
The Cold War ended when the Berlin Wall came down, and all across Eastern Europe free elections put an end to Communist regimes, until finally the Soviet Union itself broke apart.