Tension on the Russian-Ukrainian border, foreign media reports that Russia is preparing to invade Ukraine, coupled with investor concerns about rising US interest rates (the yield on the 10-year Treasury note exceeded 2% last week), the S & P 500 index fell 1.8% last Thursday (10th). Fell another 1.9% the next day, led by technology stocks. Global energy prices rose significantly, Brent oil prices continued to rise, and safe havens such...