The Schengen Agreement also allows police officers of a participating State to prosecute suspects across borders, both as regards prosecution and the continuation of observation operations and the improvement of mutual legal assistance in criminal matters.  Due to the UK`s opt-out from most of Schengen, it can continue to check on nationals from the rest of the EU to determine whether or not they are entitled to enter the UK. Under EU legislation on the free movement of persons, the UK must allow EU citizens and their family members, unless there is indications (possibly in the Schengen Information System) that they are wanted or using stolen passports. However, the entry of other persons into the United Kingdom is governed by United Kingdom law. In other words, the UK still controls its borders over most nationals of non-EU countries. One EU member state – Ireland – has negotiated Schengen waivers and continues to carry out border controls with other EU member states, while being part of the common travel area with the UK (a former EU member). The remaining four EU Member States – Bulgaria, Croatia, Cyprus and Romania – are required to join the Schengen area. However, before fully implementing the Schengen rules, each state must have its will assessed in four areas: air borders, visas, police cooperation and the protection of personal data. This evaluation process includes a questionnaire and visits by EU experts to selected institutions and jobs in the country to be assessed.  The Schengen countries are the European signatory countries to the Schengen Agreement. These countries work without internal border controls, which allows free movement between the participating countries. After Slovakia, Denmark, the Czech Republic and Poland announced in mid-March the total closure of their national borders, European Commission President Ursula von der Leyen said: “Some controls may be justified, but the World Health Organisation does not consider general travel bans to be the most effective. In addition, they have strong social and economic repercussions, disrupting people`s lives and affairs across borders.  Von der Leyen also apologized to Italy, amid widespread Italian discontent with Europe`s lack of solidarity.
 Until the end of March 2020, almost all internal Schengen borders were closed for unnecessary travel. Until July 2020, most of the borders closed because of the coronavirus were reopened. After the entry into force of ETIAS, UK citizens visiting Europe must apply for an ETIAS visa waiver online before their departure. The ETIAS visa waiver for UK citizens is valid for a period of three years and allows unlimited entry into the region. The free movement of people is one of the EU`s key principles. As soon as the United Kingdom ceases to be part of the Union`s regulatory framework, the British will no longer be able to move around the continent as is currently the case. At the end of 2009, Norway began issuing one-year visas to enter several times without the usual requirement to have a family or business partner in Norway, called Visa Pomor, to Russians from the Murmansk region and then to those from the Arkhangelsk region.  Finland does not provide for border permits, but it issued more than one million regular visas to Russians in 2011, many of which are multiple entry visas. The EU has planned to allow up to five years of validity for multiple visas for Russians.  Permits are issued with a validity period of between one and five years and allow residence in the border area for a maximum of three months. Permits can only be issued to legitimate residents of the border area who have been in the border area for at least one year (or more, if the bilateral agreement so provides). Applicants for approval must prove that they have legitimate reasons for frequently crossing an external land border under the local border traffic regime.
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