On Friday, May 31, Ukraine signed security agreements with Sweden, Iceland, and Norway. Meanwhile, Ukraine returned 71 defenders and four civilians from Russian captivity. RBC-Ukraine compiled the main news for May 31. Russia’s war against Ukraine: Latest Russia’s losses in Ukraine as of May 31: 1390 troops and 39 artillery systemsRussian missile strike on Kharkiv: Death toll risesRussian troops intensify their activity in Kharkiv region – General StaffRussian offensive in Kharkiv region: Volunteer from Switzerland wounded in VovchanskRussian army hit Odesa with cluster missile, casualties rep…