Wallström told Swedish Television "It is a very disturbing and a very serious situation. It is not a coincidence that the [UN] Security Council will discuss it again and it will definitely be top of the agenda for the foreign minister's agenda," she said.
The foreign ministers of all EU countries will meet in Brussels next week as part of the regular EU Council work to get member states to agree on polic. Each Council meeting sees the relevant ministers gather, or the premiers at the top-level Eu COuncil summits.
Wallström also wants her fellow foreign ministers to discuss how well sanctions against Russia are working, and points out it is important for the EU to present a united front on the issue.
Russia's defense ministry has denied NATO reports that it has sent troops and weapons to reinforce the pro-Russian separatists rebels in the east of Ukraine.