Estonian Prime Minister Kaja Kallas has called on the West to stand united and persevere amid intense diplomatic efforts to prevent war in eastern Europe. “Our unity in Europe is of key importance at the moment. We must have strategic patience,” she told dpa ahead of a trip to Germany. “The unity has held up so far and we are all working together to stay strong and united against Russian aggression – aggression that does not only affect Ukraine but Europe in general.” Russia has massed tens of thousands of troops close to Ukraine’s borders, triggering fears that Moscow may be planning to invad…