pretty extreme, but so are the predictions of western governments in this crisis. sarah rainsford, bbc news, kyiv. leaders from across the world gathered this weekend for the munich security conference, which was overshadowed by the ukraine crisis. chief international correspondent lyse doucet was there — and explains what leaders tried to achieve. the security barriers are coming down behind us, and the convoys of limousines are speeding to the airport to take the delegations away from this munich security conference. the chairman of the conference described it as possibly the most consequential conference in a very long time. there was regret that sergey lavrov, the russian foreign minister, decided to stay away this year. but russia was the topic of almost every discussion. it was the question that was constantly buzzing through the halls. will president putin invade ukraine?