Finland is to sign a Memorandum of Understanding with NATO, under which it will be able to receive assistance from foreign forces.
The USA will send around 600 troops to Poland and the Baltic States for infantry exercises, said the Pentagon.
Sweden´s government has announced plans to increase the budget share of defense in the years to come until 2024.
A US warship heading towards the Black Sea passed through the Dardanelles Strait on Tuesday.
US military dolphins and sea lions are due to participate in NATO's summer naval exercises in the Black Sea, a report by the newspaper Izvestia has suggested.
World military expenditure totaled USD 1.75T in 2013, a fall of 1.9% since 2012, according to figures released by Stockholm International Peace Research Institute (SIPRI).
The French anti-submarine frigate Dupleix is to join on Monday the country's vessels in the Black Sea.
Russian military aircraft are still committed to provocations over the Black Sea, Bulgaria's Defense Minister Angel Naydenov has warned.
It is US military vessels and not Russia's airplanes that pose a problem in the Black Sea, Russia's Ambassador to Bulgaria Yury Isakov said on Friday.
NATO will increase its presence in Eastern Europe and the Black Sea region, its Secretary-General Anders Fogh Rasmussen said on Friday, while on a visit to Bulgaria.
Bulgaria's President Rosen Plevneliev criticized the tightening of the country's defense budget and urged for its immediate increase.
Two vessels one from the US and another from France, passed through the Dardanelles strait early on Thursday without informing of their destination.
US Destroyer Donald Cook is to enter the Black Sea on April 10, Pentagon officials said.
Volvo said that it had paused a joint project with Russia to build an armoured infantry fighting vehicle, citing concerns about the Ukraine crisis, reports The Local.
NATO Secretary General Anders Fogh Rasmussen will come to Bulgaria on a two-day visit on Thursday.
US Defense Secretary Chuck Hagel said permanently stationing an additional U.S. Army brigade in Europe is among options to beef up security in the region.
Romania's government plans to increase its defense budget over possible tensions on its eastern borders with Ukraine.
The US navy extended the mission of the USS Truxtun in the Black Sea, reports Bulgaria's public broadcaster BNT.
Bulgaria urgently needs to modernize its air force, in the light of the situation in Ukraine, said Foreign Minister Kristian Vigenin.
Bulgaria's Defense Minister Angel Naydenov has decided to impose penalties on nine of his ministry's personnel.
The US is preparing military exercises in Poland, said US ambassador to Poland, Stephen Mull.
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