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.
Syrian refugees heading through Greece are continuing their journey to Northern Europe across the Macedonian border.
About 7,000 Syrian refugees arrived in Macedonia on Monday, according to the UN refugee agency, and more are expected as neighbouring Greece struggles to ease pressure on its own territory.
Many of the 30,000 refugees waiting in Greece, many hoping to move on to other European countries.
The Greek government has been ferrying refugees from the island of Lesbos to its main port of Piraeus.
Once disembarked, most almost immediately head north towards the border with Macedonia to continue their journey.
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.