Helle Thorning-Schmidt was speaking during a meeting with Cypriot President Nicos Anastasiades aboard the Danish frigate HDMS Esbern Snare, which is escorting Syrian chemical weapons shipments and is operating out of nearby Cyprus.
"I am still cautiously optimistic in terms of keeping the timeframe that we have adopted, but it is important that we put some pressure on the Syrians to live up to their part of the bargain, and we are here to fulfil the task," Thorning-Schmidt said.
Syria says it remains committed to a June 30 deadline to destroy its entire chemical arsenal but that the ongoing civil war is causing delays.
Danish and Norwegian naval vessels are involved in the process of removing the materials from Syria, where they will be transhipped to a US Navy vessel specially fitted with equipment to destroy them at sea.
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She was referring to deadly chemical weapons attacks outside Damascus on August 21 that Western governments accused the regime of President Bashar al-Assad of carrying out.