Financial markets see the change in geopolitical motion as a resolution of uncertainty that has plagued markets, as this Washington Post article and this CNN/Money article indicate. As both note, this behavior is consistent with the perception that a war would be short.
Note also that London oil prices remained volatile, and New York opened slightly higher, Both markets have closed substantiall lower than recent peaks (and, in real terms, well short of all-time highs), which is consistent with some expectation of future increased supplies.