BRUSSELS, April 1 - NATO suspended all practical cooperation with Russia on Tuesday in protest at its annexation of Crimea, and ordered military planners to draft measures to strengthen its defenses and reassure nervous eastern European countries, Reuters reported.

Foreign ministers from the 28-nation, U.S.-led alliance were meeting for the first time since the Russian occupation of Ukraine's Crimea region touched off the worst East-West crisis since the Cold War.

NATO Secretary-General Anders Fogh Rasmussen said Russia's actions meant there could be no "business as usual.”

"So today, we are suspending all practical cooperation with Russia, military and civilian," he told a news conference.

German Foreign Minister Frank-Walter Steinmeier said NATO's future relationship with Russia would depend, among other things, on whether Russia started withdrawing troops from the Ukrainian border.

Ministers also ordered military commanders to draw up plans for reinforcing NATO's defenses to shore up confidence among the alliance's eastern European members, including former Soviet republics in the Baltics, that NATO is ready to defend them.

The measures could include sending NATO soldiers and equipment to eastern European allies, holding more exercises, ensuring NATO's rapid reaction force could deploy more quickly, and reviewing NATO's military plans. Military planners will come back with detailed proposals within weeks, a NATO official said.

U.S. Secretary of State John Kerry said NATO's preference was for a de-escalation and diplomatic route out of the crisis.

"At the same time, it is important for everybody in the world to understand the NATO alliance takes seriously this attempt to change borders by use of force," he said.

Russia's announcement on Monday that it would move a battalion back from close to the Ukrainian border was a small but welcome gesture, he told a news conference.

"The question now is: Is there a way to build on that in order to be able to find a way to move the masses of troops back and truly de-escalate?" he said.

Rasmussen said earlier that NATO had seen no sign Russia was withdrawing its troops from the Ukrainian border.

NATO agreed at a meeting with Ukraine's foreign minister to step up cooperation with training and other programs to help modernize Ukraine's armed forces.

NATO will offer Ukraine more chances to take part in NATO exercises, Rasmussen said.

Ukraine has given NATO members a wish-list of "technical equipment" it needed for its armed forces but this did not include weaponry, Ukraine's Foreign Minister Andrij Deshchitsya told a news conference after meeting NATO ministers.

He said NATO members would send experts to Kiev next week to see what Ukraine needed.

As NATO ministers convened, Russia warned Ukraine against integration with NATO, saying Kiev's previous attempts to move closer to the defense alliance had had unwelcome consequences.

Ukraine's new pro-Western leadership has said it is not seeking membership of the Western alliance.

In another sign of NATO support, Romanian President Traian Basescu said the United States had asked to boost the number of troops and aircraft it has stationed at an air base in his country, which has a border with Ukraine. (rt/ez)