A Ukrainian serviceman patrols near the frontline with Russian Federation backed separatists near the small city of Marinka, Donetsk region on April 12. Clashes have picked up again since the start of the year.
Stoltenberg called Moscow's recent troop deployment the biggest military buildup since the conflict in eastern Ukraine began. They said the large scale troop movements are threatening and destabilizing and urged Russian Federation "to cease its provocations".
"Russia must end this military build-up in and around Ukraine, stop its provocations and de-escalate immediately", Stoltenberg said at a news conference with Kuleba.
The G7 - the United States, Britain, France, Germany, Italy, Canada and non-NATO Japan - also urged Russian Federation to uphold global "principles and commitments that it has signed up to on transparency of military movements".
Attention has focused on eastern Ukraine's Donetsk and Luhansk regions, which pro-Russian separatists seized at one point in April 2014.More news: Biden appoints commission to study adding seats, term limits for Supreme Court
Critics argued the Obama administration failed to uphold that agreement in 2014, and betrayed Ukraine after promising it membership in North Atlantic Treaty Organisation. We support Ukraine's posture of restraint.
The G7 renewed calls for all parties to implement a 2015 peace deal known as Minsk II that banned tanks and other heavy weapons.
Ukraine has accused Russian Federation of amassing thousands of military personnel on its northern and eastern borders as well as on the annexed Crimean peninsula.
The Kremlin has not denied the troop movements but has insisted that Moscow does not intend to threaten anyone.
"These large-scale troop movements, without prior notification, represent threatening and destabilising activities", the joint statement released by Britain's foreign ministry said.More news: George Floyd death caused by law enforcement, expert tells court
Fighting subsided in 2020 as a ceasefire agreement took hold last July, but clashes have picked up again since the start of the year, with each side blaming the other.
A Ukrainian soldier was killed and another seriously wounded in artillery fire from Russia-backed separatist rebels, according to Kiev's military, as hostilities rise sharply in the country's east.
In recent days, Ukrainian President Volodymyr Zelensky made a decision to head to trenches along the border to meet with his troops.
The State Department says Blinken will have meetings in the Belgian capital on Tuesday and be met there by Defense Secretary Lloyd Austin for additional consultations on Wednesday.
"President Biden reaffirmed his goal of building a stable and predictable relationship with Russian Federation consistent with USA interests, and proposed a summit meeting in a third country in the coming months to discuss the full range of issues facing the United States and Russian Federation".More news: New Zealand bans travellers from India as COVID-19 cases increase
"At the operational level, we need measures which will deter Russian Federation and which will contain its aggressive intentions", Kuleba said after the NATO-Ukraine Commission met at the alliance headquarters.