What must residents of Sweden do to determine the times for the 'Isha and Fajr prayers, given the absence of complete darkness during this month of the year?

Prayer becomes obligatory at its prescribed times for anyone residing in a country where night and day are distinguishable, even if one is long and the other short. As for someone residing in lands where night is not distinguishable from day, they must perform the five daily prayers within twenty-four hours, estimating their times based on the nearest country where the times are distinguishable. If the time for some prayers is distinguishable while others are not, then the distinguishable prayers must be performed at their specified times, and the times for the indistinguishable ones should be estimated.