Images have been released of a National Prayer Breakfast held in Kyiv over the weekend.
The event was attended by 836 people from 15 countries, including representatives of 12 denominations, Volodymyr Zelenskyy's office said.
The president was there, alongside Prime Minister Denys Shmyhal, members of parliament, church leaders, volunteers, chaplains, military personnel, veterans and athletes.
Mr Zelenskyy said the gathering comprised people with different views who were united by the desire to "ensure a true victory of good over evil for Ukraine", his office said.
Russia has been asked to stop interfering with European satellite systems - with air traffic control said to have been endangered.
Last week a UN body - the International Telecommunications Union (ITU) - reviewed a series of complaints from Ukraine and four European Union countries - France, the Netherlands, Sweden and Luxembourg - about alleged interference in recent months.
They claimed GPS signals had been jammed, air traffic control compromised and children's TV channels interrupted to show violent images of the Ukraine war.
An intact guidance system from a long-range, US-made ATACMS missile has been captured by Russian forces, Russia's RIA state news agency has reported.
Video footage released by RIA showed an unidentified individual, his face concealed by a balaclava, examining what he said was part of an Army Tactical Missile Systems weapon.
