Theresa May has insisted Britain will continue to play a part on the world stage as she arrives in Hamburg for the G20 summit.
The prime minister put counter terrorism top of the agenda as she makes tackling the growing terrorist threat her top priority at the two-day summit in Hamburg.
Speaking before meeting other world leaders, Mrs May insisted Britain's intentional role would not be affected after the UK leaves the European Union.
"What I see when I talk to leaders around the world is a genuine interest in working with Britain in the future. A Britain that will be outside the European Union.
"We will be there, around the table, putting forward the view of free trade, the importance of free trade, working with others to defeat terrorism. These are challenges that we all face. The UK has always been a leading player and will continue to be so."
Later the prime minister will address the summit on the importance of preventing terrorist funding.
In the wake of a wave of terror attacks in Britain, the prime minister will warn so-called Islamic State is exploiting loopholes to build up finances.
"Counter terrorism is top of the agenda and we'll be coming together as an international community to ask what we can do and ask what we can do together to prevent terrorist financing," Mrs May said.
Banks and financial technology companies must be on alert to find and stop large and small cash transfers that fund terror, the PM will say.
She will also call for work to be carried out with the private sector to develop new ways to track suspicious transactions.
North Korea will play a "significant part" in the discussions, with China facing intense to rein in its ally after Pyongyang's latest missile launch.
Mrs May is also set to tackle Donald Trump on climate change after the US President controversially withdrew from the Paris Agreement deal.
Mrs May will also push to:
Create 'orderly' migration by ensuring refugees claim protection in the first safe country they reach
Work with the United Nations to wipe out modern slavery by 2030
Call for a continued commitment to free trade and action to encourage greater corporate responsibility
Police are on high alert as protesters plan major demonstrations over the attendance of controversial premiers such as Mr Trump, Russia's Vladimir Putin and Turkey's Recep Tayyip Erdogan.
Two days before the summit was due to start demonstrators descended on the German city for their 'Welcome to hell' protest.
Things started peacefully but riot police used pepper spray and water cannon as some of the crowd became violent as darkness fell.
Seventy-six officers were injured in the clashes on Thursday night including three who were taken to hospital.
The pilots of a police helicopter sustained eye injuries when lasers were pointed at them, police said.
Mrs May flew into Germany ahead of the summit with husband Philip on his first official overseas visit.
He will join other spouses, such as Melania Trump, in a separate programme of events.
But will accompany the Prime Minister to a concert at the Elbphilharmonie concert hall on Friday night where Beethoven's Symphony No. 9 will be played, which includes the melody for the EU's anthem.
Chancellor Philip Hammond will also be attending the summit on Friday for a series of meetings with other finance ministers.
Labour leader Jeremy Corbyn said: "If Theresa May is serious about cutting off financial and ideological support for terrorism, she should publish the suppressed report on foreign funding of UK-based extremism and have difficult conversations with Saudi Arabia, not hug Saudi and allied Gulf States even closer."