18. In exceptional circumstances, when the Communications Regulatory Authority considers that there is an urgent need to act by way of derogation from the procedure set out in paragraphs 12 and 13 of this Article so as to safeguard competition and protect the interests of users, it may immediately adopt proportionate and provisional measures, i.e. define a relevant market, identify or not identify undertakings with significant market power on the relevant market and/or impose, not impose or withdraw one or more of the obligations referred to in Article 17 of this Law with respect to such undertakings. Such provisional measures may be imposed for a period no longer than nine months. In this case, the Communications Regulatory Authority must, without delay, communicate those measures, with full reasons, to the European Commission, the Body of European Regulators for Electronic Communications, and the national regulatory authorities of other European Union Member States. The Communications Regulatory Authority may render such measures permanent or extend the time for which they are applicable in accordance with the procedure established in paragraphs 12 and 13 of this Article. 19. The Communications Regulatory Authority shall publish the list of relevant markets for which undertakings with significant market power have been identified and the list of undertakings with significant market power as well as the obligations imposed on them, including information on the measures provided for in paragraph 18 of this Article and any changes in such information, on their website and shall submit such lists to the European Commission. 20. When conducting a market analysis, and deciding whether an undertaking has significant market power and imposing obligations on undertakings with significant market power, the Communications Regulatory Authority shall take account of the relevant provisions of international treaties and/or agreements and shall ensure, within the scope of its competence, compliance with and implementation of such treaties and/or agreements in the Republic of Lithuania. When implementing and ensuring compliance with international treaties and/or agreements, the Communications Regulatory Authority shall have the right, after consulting the European Commission and mutatis mutandis subject to the procedure and conditions set out in paragraphs 10, 14 and -18 of this Article, to impose, amend or withdraw the obligations referred to in Article 17 of this Law with respect to undertakings other than those with significant market power on the relevant market. Article 17. Imposition of obligations on undertakings having significant market power on the relevant market 31