The 100th Shipborne Fighter Aviation Regiment  was formed at Saki in the Crimea on 10 March 1986. In January 1992 its personnel refused to take the oath of loyalty to Ukraine, which would have presumably made them part of the Ukrainian Navy or Ukrainian Air Force, and instead its personnel left for Russia, leaving their aircraft and equipment behind. The unit regrouped at Severomorsk-3 as part of the Northern Fleet. However, in February 1993 the regiment was disbanded and its personnel and equipment incorporated into the 279th Shipborne Fighter Aviation Regiment. The 279th Independent Shipborne Assault Aviation Regiment was established in 1973. In 1990 it became a Maritime Assault Aviation Regiment. On 22 February 1993 it was renamed the 279th Shipborne Fighter Aviation Regiment as it absorbed the remaining elements of the 100th Shipborne Fighter Aviation Regiment.

How many years passed between the formation of the 100th Shipborne Fighter regiment and its refusal to take the oath of loyalty to Ukraine?
A: 6

In 1466, perhaps 40,000 people died of the plague in Paris. During the 16th and 17th centuries, the plague was present in Paris around 30 per cent of the time. The Black Death ravaged Europe for three years before it continued on into Russia, where the disease was present somewhere in the country 25 times between 1350 and 1490. Plague epidemics ravaged London in 1563, 1593, 1603, 1625, 1636, and 1665, reducing its population by 10 to 30% during those years. Over 10% of Amsterdams population died in 1623–1625, and again in 1635–1636, 1655, and 1664. Plague occurred in Venice 22 times between 1361 and 1528. The plague of 1576–1577 killed 50,000 in Venice, almost a third of the population. Late outbreaks in central Europe included the Italian Plague of 1629–1631, which is associated with troop movements during the Thirty Years War, and the Great Plague of Vienna in 1679. Over 60% of Norways population died in 1348–1350. The last plague outbreak ravaged Oslo in 1654.

How many years passed 1361-1528 before the plaque of Venice ended a 22nd time?
A: 167

Between 1519 and 1523 there was a succession of heavy battles and smaller skirmishes, in the course of which many towns and villages were devastated. After futile sieges of the defences of Calenberg and Hildesheim by troops from Hildesheim or Brunswick as well as numerous trails of devastation and plundering by both sides against the civilian population, the two sides finally met on 28 June 1519 at the Battle of Soltau . The Hildesheim army scored an emphatic victory against the Brunswick-Welf troops, killing some 3,500 men and capturing one of their leaders, Eric of Calenberg, as well as many of the nobles. This signalled the end of the opening phase of the war. However, an appeal to the newly elected emperor, Charles V, who had a good relationship with Wolfenbüttel, saw the situation entirely reversed at a political level. The ruling imposed by Charles V provided for the surrender of all conquered territory and release of all the prisoners, and thus ruled very much against the Hildesheim side. Because it was ignored by the bishop and his allies, the emperor's decision was followed in 1522 by the imposition of an imperial ban, the execution of which was assigned to the princes of Wolfenbüttel and Calenberg. Whilst Henry of Lüneburg had already gone into exile in France in 1520 having transferred the reins of power to his sons and in doing so keeping the Principality of Lüneburg out of the subsequent conflict, there were renewed military clashes between the Hildesheim prince-bishop and his opponents that were not finally resolved  until the so-called 'field peace'  of 15 October 1521. Hildesheim had won militarily, but lost politically.

How many years is the time span where there was a succession of heavy battles and smaller skirmishes where many towns and villages were devastated?
A:
4