David Cameron has visited camps in Lebanon and Jordan to meet Syrian refugees who have fled their country's civil war.
The Prime Minister has called on other EU countries to "step up to the plate" and follow Britain's lead by funding refugee camps around Syria.
Mr Cameron said there was a "direct connection" between shortfalls in aid for camps in Lebanon, Jordan and Turkey and the influx of migrants into Europe.
Germany is now reaching its limit on its ability to take in more refugees, a senior minister has warned as thousands of people continued to arrive in the country over the weekend.
In an interview with Der Tagesspiegel newspaper, the country's Economy Minister Sigmar Gabriel criticised his counterparts across Europe for a lack of action on the issue.
Around 13,000 arrived in Munich alone on Saturday, and the country expects 800,000 new arrivals by the end of the year.
"It's true: The European lack of action in the refugee crisis is now pushing even Germany to the limit of its ability," Mr Gabriel said.
On a visit to Jordan, David Cameron says that the EU must "follow Britain's lead" and fund more refugee camps around Syria.
The prime minister has insisted the UK will not participate in plans to redistribute 160,000 refugees who have arrived in Europe.
Train traffic with Austria suspended as German authorities seek to reduce the number of asylum seekers arriving in the country.