 Security forces have detained more than 1,300 people in Russia at the protest denouncing mobilisation rights group set these hours after President Vladimir Putin ordered Russia's first military draft since World War II. Details in this next report. More than 1,000 people have been arrested at protests across Russia and one-way flights out of the country have sold out. In a wave of panic triggered by this moment, a speech made by President Putin on Wednesday calling up 300,000 conscripts to fight in Ukraine with immediate effect, signifying a major escalation in the conflict and Russia's first wartime mobilisation since World War II. After Putin's speech, citizens were already receiving orders to enlist, according to a human rights lawyer. In St. Petersburg, recruitment officers handed packs of conscription papers to homeowner's associations. Here, and in 37 other Russian cities, demonstrations erupted. Protesters chanting no to war as police carried out arrests. Russia's defence minister said the army was calling up people with experience of service and military specialists. But there was little clarity as to who these would be. Medical skills appeared to be in demand, as medics across Moscow received summons on mass to go and receive mobilisation orders. On the Moscow Metro, men could be seen studying call-up papers. On the streets, some residents were concerned. Some told Reuters, you can always feel worried at moments like these because you have a wife and kids and you think about it. Another in the city of Kursk said, they're not letting people out of Kursk. There are police cordons everywhere, checking each car. If the man is from Kursk, they turn you back. Fears of not being allowed to leave sent one-way flights out of Russia skyrocketing in price, selling out soon after Putin's announcement. Google Trends data showed a spike in searches for avia sales, Russia's most popular flight booking site. On Thursday morning, dozens of Russians from Moscow touched down in Serbia's capital, Belgrade. One traveller, Pavel, who'd booked his flight before the announcement, said he would be returning to Russia. As our defence minister said, one percent of the population would be sufficient to fulfil the goal of the mobilisation. The Kremlin declined to comment on whether the borders would be close to those subject to the mobilisation order and asked people to be patient as the law is clarified.