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| 1940, June 26 |
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| The Soviet Union demanded the return of Bessarabia and the cession of northern Bukovina. The disputed territory, 19,300 square miles with a population of 3.5 million, was occupied by Soviet troops on June 28. | 1 |
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| July 1 |
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| Romania renounced the Anglo-French guarantee of its integrity. | 2 |
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| Aug. 30 |
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| Under pressure from Berlin and Rome, the government agreed to yield an area of 16,642 square miles with a population of almost 2.4 million to Hungary (Vienna conference). | 3 |
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| Sept. 6 |
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| Under pressure from the Iron Guard, King Carol fled and was replaced by his son, Michael. | 4 |
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| Sept. 8 |
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| A further territorial cession of some 3,000 square miles (southern Dobrudja) was demanded by, and yielded to, Bulgaria (Treaty of Craiova). | 5 |
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| Oct. 8 |
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| German troops entered Romania to “protect” the oil fields. | 6 |
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| Nov. 23 |
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| Romania joined the Rome-Berlin-Tokyo tripartite pact. | 7 |
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| Nov. 27 |
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| The Iron Guard executed 64 former officials of King Carol's government while rioting spread throughout Romania. | 8 |
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