The Baltic states of Lithuania, Latvia and Estonia said they had agreed to link their power systems to other European Union members through Poland.
In the past year, NATO and Russia have discussed a proposal to reduce the risk of air accidents in the crowded skies over the Baltic Sea.
The meeting between German Chancellor Angela Merkel and Russian President Vladimir Putin in Sochi has great significance.
The sanctions, including travel bans and asset freezes, against Moscow were originally introduced in March 2014.
Estonia is determined to stay independent of Russia. As it trains its people as reserve fighters, Donald Trump and Vladimir Putin have brought new uncertainty
Baltic states have repeatedly voiced their concern at the Russian military build-up in the exclave sandwiched between Poland and Lithuania, both EU and NATO members.
Estonia wants the limit of goods transported across the border to be reduced in Europe as a result of alcohol bought in Latvia and taken to Estonia.
The unemployment rate in the wider 28-country EU was 8.3 percent in November 2016, down by 0.1 percentage point compared with the preceding month and 0.7 percentage point compared with November 2015.
The United States is moving a tank brigade to Eastern Europe with the first military equipment and vehicles being unloaded in the German port of Bremerhaven on Friday.
John McCain has pledged US support to the security of Russia's three Baltic neighbors amid worries that the US may not be fully committed to the defense of NATO allies following statements by US President-elect Donald Trump. He added that Washington should consider basing troops permanently at least in Estonia.