* Planners to draft measures to strengthen NATO defences
* Alliance to increase cooperation with Ukraine
* Poland says it wants more NATO forces on its soil
* U.S. considers sending warship to Black Sea (Adds Pentagon official, paragraphs 14-15)
By Adrian Croft and Sabine Siebold
BRUSSELS, April 1 (Reuters) - 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 defences and reassure nervous Eastern Europe.
Foreign ministers from your 28-nation, U.S.-led alliance were meeting the very first time since the Russian occupation of Ukraine's Crimea region touched journey worst East-West crisis considering that the Cold War.
NATO Secretary-General Anders Fogh Rasmussen said Russia's actions meant there may be no "business as usual".
"So today, i am suspending all practical cooperation with Russia, military and civilian," he told a press conference.
German Foreign Minister Frank-Walter Steinmeier said NATO's future relationship with Russia is based, amongst other things, on whether Russia started withdrawing troops through the Ukrainian border.
Ministers also ordered military commanders to draw up plans for reinforcing NATO's defences to prop up confidence one of the alliance's Eastern European members, including former Soviet republics within the Baltics, that NATO is just about 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 quicker, and reviewing NATO's military plans. Military planners is with detailed proposals within weeks, a NATO official said.
U.S. Secretary of State John Kerry said NATO's preference was for any de-escalation and diplomatic route out from the crisis.
"As well, it's important for everyone on the globe to comprehend the NATO alliance takes seriously this try and change borders by using force," he was quoted saying.
Russia's announcement on Monday so it would move a battalion back from close to the Ukrainian border would have been a small but welcome gesture, he told a news conference.
"The question now's: Can there be ways to build upon that to become capable of finding a means to move the multitude of troops back and truly de-escalate?" he explained.
Rasmussen said earlier that NATO saw no sign Russia was withdrawing its troops in the Ukrainian border.
The usa and also other NATO allies have taken care of immediately the crisis through providing more planes to get acquainted with regular NATO air patrols within the Baltic States, that have been once Soviet republics. North america has beefed up a previously planned training exercise with the Polish airforce.
A Pentagon official told Reuters on Tuesday the top U.S. general in Europe was investigating options, including moving a U.S. warship on the Black Sea and bolstering scheduled NATO exercises.
General Philip Breedlove, who's going to be both NATO's supreme allied commander Europe and head of the U.S. military's European Command, was "going to consider the full spate of upcoming NATO exercises" to determine if there are ways they are often enhanced, the U.S. official said.
Germany had offered six Eurofighter jets for Baltic air patrols and another command ship for a mine hunting unit from the Baltic Sea, a NATO source told Reuters.
The suspension of NATO cooperation with Russia would mean Russia can't participate in joint exercises for example one planned for May on rescuing a stranded submarine, a NATO official said.
But Rasmussen said he expected Russia's cooperation with NATO in Afghanistan - on training counter-narcotics personnel, repair of Afghan airforce helicopters along with a transit route outside the war-torn country - to stay.
Contacts between NATO and Russia at ambassadorial level or higher may happen, so the two sides can discuss ways out of your crisis.
NATO agreed at the meeting with Ukraine's secretary of state to improve cooperation with training along with programmes to help modernise Ukraine's armed services.
The alliance will give you Ukraine more chances to take part in NATO exercises, Rasmussen said.
Ukraine has given NATO members a wish-list of "technical equipment" it required for its military but this failed to include weaponry, Ukraine's Secretary of state Andrij Deshchitsya told a news conference after meeting NATO ministers.
He was quoted saying NATO members would send experts to Kiev in the near future to find out what Ukraine needed.
As NATO ministers convened, Russia warned Ukraine against integration with NATO, saying Kiev's previous tries to move closer to the defence alliance had unwelcome consequences.
Ukraine's new pro-Western leadership says it's not seeking membership in the Western alliance.
In another sign of NATO support, Romanian President Traian Basescu said the United States had asked to improve the number of troops and aircraft they have stationed at an air base in their country, with a border with Ukraine.
But Polish Premier Donald Tusk said on Tuesday which the pace at which NATO was increasing its military presence in Poland was unsatisfactory.
Polish Foreign Minister Radoslaw Sikorski, who said earlier however be satisfied if NATO located two heavy brigades in Poland, said on arrival at the NATO meeting that he would welcome any NATO forces being stationed there.
Germany's Steinmeier said the basing of an significant NATO force in Poland would not be completely in line with a 1997 treaty on NATO-Russian cooperation.