More than 200 firefighters and equipment from Bulgaria, France, Germany, Romania, Norway and Finland will be on standby during the hottest months of July and August in Greece, where a spate of wildfires caused devastation last summer.
A group of 28 Romanian firefighters with eight vehicles, and 16 firefighters from Bulgaria with four vehicles, were the first to arrive for the two-month mission, financed and coordinated under the European Union's civil protection mechanism.
"We thank you very much for coming to help us during a difficult summer for our country, and for proving that European solidarity is not just theoretical, it's real," Greek Civil Protection Minister Christos Stylianides said on Saturday as he welcomed the members of the Romanian mission in Athens.
"When things get tough, you will be side by side with our Greek firefighters so we can save lives and property."
The Bulgarian firefighters have been stationed in Larissa, in central Greece.
Last summer's wildfires ravaged about 300,000 acres (121,000 hectares) of forest and bushland in different parts of Greece as the country experienced its worst heatwave in 30 years.
Following sharp criticism of its response to the fires, the Greek government set up a new civil protection ministry and promised to boost firefighting capacities.