The UN nuclear watchdog says it has found no sign of undeclared nuclear activity at three sites in Ukraine that it inspected at Kyiv's request in response to Russian allegations it was working on a "dirty bomb." Moscow has accused Ukraine of planning to use such a bomb and said institutes linked to the nuclear industry were involved in preparations, without presenting evidence. Ukraine's government denies the accusation. Some Ukrainian and Western officials have accused Moscow of making the allegation to give itself cover to detonate its own dirty bomb and blame Kyiv. To read the original story from Reuters, click here.