There is no formal rule in international law which would prevent States from holding elections or referendums during emergency situations either. Yet, under several constitutions an extraordinary situation will postpone, or provide an opportunity to postpone upcoming elections, for example by extending the term of parliament (Croatia, Italy, Germany, Greece, Poland, Lithuania, Slovenia, Spain,Hungary and Canada). Similarly, a situation of emergency may prohibit the dissolution of parliament (Germany, Spain, Portugal, Poland, Hungary, Russia). In Turkey, a declared state of war causes elections to be postponed (Article 78 of the Constitution).