US President-elect Donald Trump is preparing a series of sanctions strategies to facilitate a diplomatic agreement between Russia and Ukraine, as well as putting pressure on Iran and Venezuela, Bloomberg quoted sources as saying.Trump's team is considering two approaches, one of which is to extend an olive branch by easing sanctions on Russian oil companies if a solution to the Russia-Ukraine issue is in sight, sources said. The other option is to tighten sanctions. The plans are still at a preliminary stage and ultimately depend on Trump.Related NewsHSBC Research: CN Tariffs Have Little Impact on LNG Imports Like ENN ENERGY; PETROCHINA Preferred Among Heavyweight OilsTrump is reviewing his policy options on Iran and Venezuela, the report added. The team has broadly agreed to reinstate extremely restrictive sanctions on Iran, targeting major oil companies, as soon as early-February. The situation is more complicated in Venezuela, where Chevron (CVX.US) has a presence.(Real-time Streaming US Stocks Quote; Except All OTC quotes are at least 15 minutes delayed.)