At least 14 people have been killed after an explosion on a trolleybus in the Russian city of Volgograd, Reuters reports.
Russian investigators believe a male suicide bomber carried out the attack which comes a day after a suicide bomb attack on the city's train station killed 17.
More top news
The leaders are set to have a one-on-one meeting.
Huawei is among a range of stories leading the papers on Thursday.
William is visiting the country on behalf of the Queen and will also honour the victims of the Christchurch terrorist attack.