According to reports, the u.s. president’s four day trip to europe to strengthen resolve, particularly with regard to sanctions ended with a visit to Poland. Reportedly, there is strong disagreement about imposing sanctions on russian gas and oil. According to reports, the u.s. president said european nations should end their dependence on russian gas supplies and wean off fossil fuels. Reportedly, the u.s. are heavily involved in nuclear electricity. According to reports, concerns are of safety and the environmental impact. According to a report, the eu have agreed to a quantity of shipments of u.s. gas.