World leaders also condemn the violence that killed at least 20 in the country's capital and declare support for its citizens.
A deadly attack in Tunisia "strengthens our determination" to fight global terror, the European Union's Federica Mogherini says.
A museum in the Tunisian parliament complex was filled with about 100 tourists when two armed attackers entered and opened fire.
The foreign minister's comments came as the Ukrainian government was reporting more attacks by pro-Russian rebels.
The two leaders spoke by phone Saturday, calling on separatists to respect a ceasefire agreement in eastern Ukraine.
It was unclear whether any potential assistance to the NATO member's eastern neighbor would include U.S.-made weapons.
Leaders of European countries have rejected the idea of a standing European army to counter Russian hostility.
Most ministers at an EU meeting in the Latvian capital said Europe should only consider tightening sanctions if the ceasefire was seriously violated.
The U.S. military will arrive in Romania and Bulgaria before expanding operations to other regions of Eastern Europe.
Frank Underwood's motivations in this season have been the subject of debate on torrent sites throughout the world.
Britain is one of several NATO nations that are not meeting their commitments on defense spending.
Poland is one of Russia's strongest critic and on Wednesday it stepped up its direct support for Ukraine.
Amid sanctions, food prices in Russia are rising.
The Oscar-winning director is wanted in the U.S. over charges of having sex with a minor in 1977.
The comedy "Wild Tales" from writer-director Damian Szifron has scary mobsters, aggressive drivers and cheating grooms.
Samsung's U.S. rollout of Google's new software continues with the T-Mobile Galaxy S5.
Despite the fall of Debaltseve, NATO claims that Russia is continuing to send tanks and artillery into Ukraine.
The man is said to have served at the Nazi death camp Auschwitz between January 1942 and June 1944, according to a report.
Warsaw is boosting its defense budget by $42 billion, as a "new cold war" with Russia festers.
Wind projects in 2015 could soar even higher as companies chase government incentives and countries address climate change.
The diplomat warned of the threat of "terrorist and criminal infiltration."
NATO's top leaders met Thursday to discuss an expansion of its rapid-reaction force from 13,000 to 30,000 troops.