How long is the story supposed to be?
<span>The International Court of Justice (ICJ) is the principal judicial organ of the United Nations. Its role is to adjudicate disputes submitted to it by States in accordance with international law and to give advisory opinions on legal questions referred to it by authorized United Nations organs and specialized agencies.</span>
The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
