David Cameron said sexual violence has "no place as a weapon of war in this world" as a global summit on the issue opened its doors.
The Prime Minister said: "This Government will always seek to protect the most vulnerable in society, both at home and abroad.
"Both in the Modern Slavery Bill and in our campaign against sexual violence in conflict we are protecting victims and punishing perpetrators - with tougher sentences for traffickers and ending impunity for soldiers who commit rape."
"Britain should not and will not tolerate trafficking," he added.
More top news
The Midland's city is in carnival mood as Leicester City face Manchester United in a match that could secure them the championship crown.
The actress attended the annual dinner dressed in purple and sporting a temporary tattoo in tribute to pop star Prince who died last month.
Charity says there has been a big rise in employees unfairly treating pregnant women and new mothers.