There was a relatively slack period in past three months in Syria, he noted.
"We have seen that in the regions that were completely cut-off from supplies, once again the possibility to send special transport reemerged. However, not all of the territories have been made available for humanitarian missions [access]," Steinmeier added.
The ISSG, co-chaired by Moscow and Washington, was formed in November 2015, shortly after the beginning of the Syria peace talks, as a panel of countries seeking to end bloodshed in Syria. The European Union, the Arab League, China, Iran, Turkey, and the United Nations are also members of the group.
