The four leaks detected on the Nord Stream 1 and 2 pipelines started tit for tat accusations between Russia and the US.
Karins, a 57-year-old dual US and Latvian citizen, said he will be working to craft a coalition of like-minded parties.
Opinion polls suggest that up to eight political parties may enter the next parliament, with the centre-right GERB party of former premier Boyko Borissov leading with about 25 percent of the vote.
Russia says its troops had abandoned key bastion of Lyman in occupied eastern Ukraine, a stinging defeat that prompted a close ally of President Putin to call for the possible use of low-grade nuclear weapons on day 220 of fighting.
The Nord Stream 1 and 2 pipelines, which carry Russian natural gas to Europe, were leaking after underwater explosions.
No one has taken responsibility for the explosions, which damaged Nord Stream gas pipelines.
Nicaragua's foreign ministry says the decision was taken because the "interventionist and neo-colonial" European country had "offended and keeps offending Nicaraguan families".
Polls ahead of the general election have shown a weakening of populist, conservative and the social-democratic parties.
Multiple gas leaks in the Baltic Sea on the Nord Stream gas pipelines from Russia to Europe may have led to the "largest [Methane] emission event ever detected," UN says.
Moscow's decision to annex four Ukrainian regions "constitutes a grave violation of the established principles of international law [and] cannot be accepted", says Turkish Foreign Ministry.
UN Security Council resolution introduced by US and Albania condemning Moscow's annexation of parts of Ukraine fails to pass after Russian veto, with China, India, Brazil and Gabon abstaining from the vote.
President Putin announces annexation of Ukrainian regions under the control of Russia's forces and a strike kills at least 30 people in Zaporizhzhia — one of the four occupied regions — as the conflict enters its 219th day.
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