under house arrest for alleged money laundering. 17 September – A rocket attack by pro-Russian separatists in eastern Ukraine kills 10 civilians and injures 12 others in the village of Nyzhnya Krynka near Donetsk. 21 September More than 26,000 people in Moscow participate in the largest demonstration so far against Russian president Vladimir Putin and the War in Donbass. Rallies in support of Ukraine and against the War in Donbass take place in Boston, New York, Sydney, Dublin, Madrid, London, Paris, Oslo, Tallinn, Limassol, Istanbul, Antalya, Cologne, Milan, Rome, Vienna, Munich, Prague, Berlin, Moscow, Volgograd, Yekaterinburg, Perm, Krasnoyarsk, Novosibirsk, Berlaul and Petropavlovsk-Kamchatsky. 23 September – President of Russia Vladimir Putin warns in a letter to his Ukrainian counterpart Petro Poroshenko that Moscow will restrict Ukraine's access to Russian markets if Kiev implements any part of a trade agreement with the European Union. 24 September – A law is signed that limits foreign ownership stakes in any Russian media assets to 20% by early 2017. Japan imposes additional sanctions on Russia due to the Ukraine conflict and a visit by an aide of the President of Russia Vladimir Putin to a contested island off the coast off northern Japan. 29 September – Renewed clashes around the Donetsk International Airport between the pro-Russian rebels and Ukrainian government troops kill at least 12 people in the worst flareup of violence since the ceasefire accord earlier in September. 30 September – The Ukrainian military say they have repelled a renewed assault by the pro-Russian forces on the Donetsk International Airport. The airport has been under sustained assaults for over 2 weeks despite an official ceasefire. October 5 October – Four police officers are killed and four others wounded in a suicide bombing in Grozny, the capital of Russia's North Caucasian republic of Chechnya. 16 October – Swedish Military caught a Russian signal from Stockholm archipelago going to Kaliningrad. The signal was sent between a transmitter in Kanholmsfjärden and a transmitter in Kaliningrad. Tomas Reis from the Försvarshögskolan in Sweden confirms that it is a Russian Submarine. The Swedish military also caught a distress call coming from the submarine. Swedish military is hunting down the sub. 17 October – Vladimir Putin, the President of Russia, and Petro Poroshenko, the President of Ukraine, will meet at the sidelines of the Asia–Europe Meeting in Milan, Italy to discuss the conflict and supplies of natural gas. 21 October